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main_single.cpp
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// for online submission only
#pragma GCC optimize("O3")
#include <algorithm>
#include <chrono>
#include <iostream>
#include <random>
#include <vector>
#include "jsoncpp/json.h"
#define max(a, b) ((a) >= (b) ? (a) : (b))
#define min(a, b) ((a) <= (b) ? (a) : (b))
class Zobrist;
class Board {
public:
enum PIECE_COLOR {
WHITE = 0,
BLACK = 1,
};
enum BOARD_STATE {
INVALID = -1,
WHITE_PIECE = PIECE_COLOR::WHITE,
BLACK_PIECE = PIECE_COLOR::BLACK,
UNPLACE = 2
};
Board();
~Board();
/** Display Board */
void display() const;
/** Update state at (x, y) */
void placeAt(int x, int y, PIECE_COLOR color);
void unplaceAt(int x, int y);
/** Get the state of (x, y) */
BOARD_STATE getState(int x, int y) const;
int cntNeighbour(int x, int y) const { return m_cntNeighbour[x][y]; }
unsigned long long getBoardHash() const;
const static int BOARD_SIZE = 15;
const static int dr[4];
const static int dc[4];
private:
Zobrist *m_pZobristHash = nullptr;
BOARD_STATE m_boardState[BOARD_SIZE][BOARD_SIZE];
int m_cntNeighbour[BOARD_SIZE][BOARD_SIZE];
};
class Zobrist {
public:
Zobrist();
static unsigned long long generateRandomNumber();
unsigned long long update(int x, int y, Board::PIECE_COLOR);
unsigned long long getBoardHash() { return m_boardHash; }
private:
unsigned long long m_hashTable[2][Board::BOARD_SIZE][Board::BOARD_SIZE];
unsigned long long m_boardHash;
};
const int Board::dr[4] = {0, 1, 1, 1};
const int Board::dc[4] = {1, 1, 0, -1};
Board::Board() {
for (int i = 0; i < BOARD_SIZE; i++)
for (int j = 0; j < BOARD_SIZE; j++) {
m_boardState[i][j] = UNPLACE;
m_cntNeighbour[i][j] = 0;
}
for (int i = 6; i <= 8; i++)
for (int j = 6; j <= 8; j++) {
m_cntNeighbour[i][j] = 1;
}
m_pZobristHash = new Zobrist();
}
Board::~Board() { delete m_pZobristHash; }
Board::BOARD_STATE Board::getState(int x, int y) const {
if (x < 0 || x >= BOARD_SIZE || y < 0 || y >= BOARD_SIZE) {
return BOARD_STATE::INVALID;
}
return m_boardState[x][y];
}
void Board::display() const {
std::cout << " ";
for (int i = 0; i < BOARD_SIZE; i++)
std::cout << char(i < 10 ? (int)i + '0' : 'A' + (int)i - 10) << " ";
std::cout << std::endl;
for (int i = 0; i < BOARD_SIZE; i++) {
std::cout << char(i < 10 ? (int)i + '0' : 'A' + (int)i - 10) << "|";
for (int j = 0; j < BOARD_SIZE; j++) {
if (m_boardState[i][j] == BOARD_STATE::UNPLACE)
std::cout << "* ";
else
std::cout << (int)m_boardState[i][j] << " ";
}
std::cout << std::endl;
}
}
void Board::placeAt(int x, int y, Board::PIECE_COLOR color) {
m_boardState[x][y] = static_cast<BOARD_STATE>(color);
m_pZobristHash->update(x, y, color);
for (int k = 0; k < 4; k++) {
int tx = x;
int ty = y;
for (int step = 1; step <= 2; step++) {
tx += dr[k];
ty += dc[k];
if (getState(tx, ty) == INVALID) break;
m_cntNeighbour[tx][ty]++;
}
tx = x;
ty = y;
for (int step = 1; step <= 2; step++) {
tx -= dr[k];
ty -= dc[k];
if (getState(tx, ty) == INVALID) break;
m_cntNeighbour[tx][ty]++;
}
}
}
void Board::unplaceAt(int x, int y) {
m_pZobristHash->update(x, y, static_cast<PIECE_COLOR>(m_boardState[x][y]));
m_boardState[x][y] = Board::BOARD_STATE::UNPLACE;
for (int k = 0; k < 4; k++) {
int tx = x;
int ty = y;
for (int step = 1; step <= 2; step++) {
tx += dr[k];
ty += dc[k];
if (getState(tx, ty) == INVALID) break;
m_cntNeighbour[tx][ty]--;
}
tx = x;
ty = y;
for (int step = 1; step <= 2; step++) {
tx -= dr[k];
ty -= dc[k];
if (getState(tx, ty) == INVALID) break;
m_cntNeighbour[tx][ty]--;
}
}
}
unsigned long long Board::getBoardHash() const { return m_pZobristHash->getBoardHash(); }
class Scorer {
public:
enum Type {
FIVE = 0,
LIVE_FOUR = 1,
KILL_1 = 2,
KILL_2 = 3,
SLEEP_FOUR = 4,
LIVE_THREE = 5,
SLEEP_THREE = 6,
LIVE_TWO = 7,
SLEEP_TWO = 8,
BASE = 9
};
Scorer();
~Scorer() { delete[] m_pTypeTable; }
Type getTypeByLineState(int state) const { return m_pTypeTable[state]; }
const static int CNT_STATES = 19683;
const static int CNT_TYPES = 10;
const static int TYPE_SCORES[CNT_TYPES];
const static int BASE_SCORES[Board::BOARD_SIZE][Board::BOARD_SIZE];
private:
Type *m_pTypeTable;
};
const int Scorer::TYPE_SCORES[CNT_TYPES] = {99999999, 10000000, 100000, 10000, 1000,
1000, 100, 100, 10, 0};
const int Scorer::BASE_SCORES[Board::BOARD_SIZE][Board::BOARD_SIZE] = {
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0},
{0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 0},
{0, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 0},
{0, 1, 2, 3, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 0},
{0, 1, 2, 3, 4, 5, 5, 5, 5, 5, 4, 3, 2, 1, 0},
{0, 1, 2, 3, 4, 5, 6, 6, 6, 5, 4, 3, 2, 1, 0},
{0, 1, 2, 3, 4, 5, 6, 7, 6, 5, 4, 3, 2, 1, 0},
{0, 1, 2, 3, 4, 5, 6, 6, 6, 5, 4, 3, 2, 1, 0},
{0, 1, 2, 3, 4, 5, 5, 5, 5, 5, 4, 3, 2, 1, 0},
{0, 1, 2, 3, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 0},
{0, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 0},
{0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 0},
{0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}};
Scorer::Scorer() {
m_pTypeTable = new Type[CNT_STATES];
for (int i = 0; i < CNT_STATES; i++) m_pTypeTable[i] = BASE;
m_pTypeTable[364] = FIVE;
m_pTypeTable[1093] = FIVE;
m_pTypeTable[1094] = FIVE;
m_pTypeTable[1822] = FIVE;
m_pTypeTable[3280] = FIVE;
m_pTypeTable[3281] = FIVE;
m_pTypeTable[3283] = FIVE;
m_pTypeTable[3284] = FIVE;
m_pTypeTable[4009] = FIVE;
m_pTypeTable[5467] = FIVE;
m_pTypeTable[5468] = FIVE;
m_pTypeTable[6196] = FIVE;
m_pTypeTable[9841] = FIVE;
m_pTypeTable[9842] = FIVE;
m_pTypeTable[9844] = FIVE;
m_pTypeTable[9845] = FIVE;
m_pTypeTable[9850] = FIVE;
m_pTypeTable[9851] = FIVE;
m_pTypeTable[10570] = FIVE;
m_pTypeTable[12028] = FIVE;
m_pTypeTable[12029] = FIVE;
m_pTypeTable[16402] = FIVE;
m_pTypeTable[16403] = FIVE;
m_pTypeTable[16405] = FIVE;
m_pTypeTable[16406] = FIVE;
m_pTypeTable[17131] = FIVE;
m_pTypeTable[18589] = FIVE;
m_pTypeTable[18590] = FIVE;
m_pTypeTable[121] = FIVE;
m_pTypeTable[122] = SLEEP_FOUR;
m_pTypeTable[124] = SLEEP_FOUR;
m_pTypeTable[125] = SLEEP_THREE;
m_pTypeTable[130] = SLEEP_FOUR;
m_pTypeTable[131] = SLEEP_THREE;
m_pTypeTable[148] = SLEEP_FOUR;
m_pTypeTable[149] = SLEEP_THREE;
m_pTypeTable[151] = SLEEP_THREE;
m_pTypeTable[152] = SLEEP_TWO;
m_pTypeTable[202] = SLEEP_FOUR;
m_pTypeTable[203] = SLEEP_THREE;
m_pTypeTable[205] = SLEEP_THREE;
m_pTypeTable[206] = SLEEP_TWO;
m_pTypeTable[211] = SLEEP_THREE;
m_pTypeTable[212] = SLEEP_TWO;
m_pTypeTable[229] = SLEEP_THREE;
m_pTypeTable[230] = SLEEP_TWO;
m_pTypeTable[232] = SLEEP_TWO;
m_pTypeTable[233] = BASE;
m_pTypeTable[365] = FIVE;
m_pTypeTable[367] = SLEEP_FOUR;
m_pTypeTable[368] = SLEEP_FOUR;
m_pTypeTable[373] = SLEEP_FOUR;
m_pTypeTable[374] = SLEEP_FOUR;
m_pTypeTable[391] = SLEEP_FOUR;
m_pTypeTable[392] = SLEEP_FOUR;
m_pTypeTable[394] = SLEEP_THREE;
m_pTypeTable[395] = SLEEP_THREE;
m_pTypeTable[445] = SLEEP_FOUR;
m_pTypeTable[446] = SLEEP_FOUR;
m_pTypeTable[448] = SLEEP_THREE;
m_pTypeTable[449] = SLEEP_THREE;
m_pTypeTable[454] = SLEEP_THREE;
m_pTypeTable[455] = SLEEP_THREE;
m_pTypeTable[607] = FIVE;
m_pTypeTable[608] = LIVE_FOUR;
m_pTypeTable[610] = SLEEP_FOUR;
m_pTypeTable[611] = LIVE_THREE;
m_pTypeTable[616] = SLEEP_FOUR;
m_pTypeTable[617] = LIVE_THREE;
m_pTypeTable[634] = SLEEP_FOUR;
m_pTypeTable[635] = LIVE_THREE;
m_pTypeTable[637] = SLEEP_THREE;
m_pTypeTable[638] = LIVE_TWO;
m_pTypeTable[688] = SLEEP_FOUR;
m_pTypeTable[689] = LIVE_THREE;
m_pTypeTable[691] = SLEEP_THREE;
m_pTypeTable[692] = LIVE_TWO;
m_pTypeTable[697] = SLEEP_THREE;
m_pTypeTable[698] = LIVE_TWO;
m_pTypeTable[1096] = FIVE;
m_pTypeTable[1097] = FIVE;
m_pTypeTable[1102] = SLEEP_FOUR;
m_pTypeTable[1103] = SLEEP_FOUR;
m_pTypeTable[1120] = SLEEP_FOUR;
m_pTypeTable[1121] = SLEEP_FOUR;
m_pTypeTable[1123] = SLEEP_FOUR;
m_pTypeTable[1124] = SLEEP_FOUR;
m_pTypeTable[1174] = SLEEP_FOUR;
m_pTypeTable[1175] = SLEEP_FOUR;
m_pTypeTable[1177] = SLEEP_FOUR;
m_pTypeTable[1178] = SLEEP_FOUR;
m_pTypeTable[1183] = SLEEP_THREE;
m_pTypeTable[1184] = SLEEP_THREE;
m_pTypeTable[1336] = FIVE;
m_pTypeTable[1337] = LIVE_FOUR;
m_pTypeTable[1339] = LIVE_FOUR;
m_pTypeTable[1340] = SLEEP_FOUR;
m_pTypeTable[1345] = SLEEP_FOUR;
m_pTypeTable[1346] = LIVE_THREE;
m_pTypeTable[1363] = SLEEP_FOUR;
m_pTypeTable[1364] = LIVE_THREE;
m_pTypeTable[1366] = LIVE_THREE;
m_pTypeTable[1367] = SLEEP_THREE;
m_pTypeTable[1823] = FIVE;
m_pTypeTable[1825] = LIVE_FOUR;
m_pTypeTable[1826] = LIVE_FOUR;
m_pTypeTable[1831] = SLEEP_FOUR;
m_pTypeTable[1832] = SLEEP_FOUR;
m_pTypeTable[1849] = SLEEP_FOUR;
m_pTypeTable[1850] = SLEEP_FOUR;
m_pTypeTable[1852] = LIVE_THREE;
m_pTypeTable[1853] = LIVE_THREE;
m_pTypeTable[1903] = SLEEP_FOUR;
m_pTypeTable[1904] = SLEEP_FOUR;
m_pTypeTable[1906] = LIVE_THREE;
m_pTypeTable[1907] = LIVE_THREE;
m_pTypeTable[1912] = SLEEP_THREE;
m_pTypeTable[1913] = SLEEP_THREE;
m_pTypeTable[2065] = FIVE;
m_pTypeTable[2066] = LIVE_FOUR;
m_pTypeTable[2068] = SLEEP_FOUR;
m_pTypeTable[2069] = LIVE_THREE;
m_pTypeTable[2074] = SLEEP_FOUR;
m_pTypeTable[2075] = LIVE_THREE;
m_pTypeTable[2092] = SLEEP_FOUR;
m_pTypeTable[2093] = LIVE_THREE;
m_pTypeTable[2095] = SLEEP_THREE;
m_pTypeTable[2096] = LIVE_TWO;
m_pTypeTable[3289] = FIVE;
m_pTypeTable[3290] = FIVE;
m_pTypeTable[3307] = SLEEP_FOUR;
m_pTypeTable[3308] = SLEEP_FOUR;
m_pTypeTable[3310] = SLEEP_FOUR;
m_pTypeTable[3311] = SLEEP_FOUR;
m_pTypeTable[3361] = SLEEP_FOUR;
m_pTypeTable[3362] = SLEEP_FOUR;
m_pTypeTable[3364] = SLEEP_FOUR;
m_pTypeTable[3365] = SLEEP_FOUR;
m_pTypeTable[3370] = SLEEP_FOUR;
m_pTypeTable[3371] = SLEEP_FOUR;
m_pTypeTable[3523] = FIVE;
m_pTypeTable[3524] = LIVE_FOUR;
m_pTypeTable[3526] = LIVE_FOUR;
m_pTypeTable[3527] = SLEEP_FOUR;
m_pTypeTable[3532] = LIVE_FOUR;
m_pTypeTable[3533] = SLEEP_FOUR;
m_pTypeTable[3550] = SLEEP_FOUR;
m_pTypeTable[3551] = LIVE_THREE;
m_pTypeTable[3553] = LIVE_THREE;
m_pTypeTable[3554] = SLEEP_THREE;
m_pTypeTable[4010] = FIVE;
m_pTypeTable[4012] = LIVE_FOUR;
m_pTypeTable[4013] = LIVE_FOUR;
m_pTypeTable[4018] = LIVE_FOUR;
m_pTypeTable[4019] = LIVE_FOUR;
m_pTypeTable[4036] = SLEEP_FOUR;
m_pTypeTable[4037] = SLEEP_FOUR;
m_pTypeTable[4039] = LIVE_THREE;
m_pTypeTable[4040] = LIVE_THREE;
m_pTypeTable[4090] = SLEEP_FOUR;
m_pTypeTable[4091] = SLEEP_FOUR;
m_pTypeTable[4093] = LIVE_THREE;
m_pTypeTable[4094] = LIVE_THREE;
m_pTypeTable[4099] = LIVE_THREE;
m_pTypeTable[4100] = LIVE_THREE;
m_pTypeTable[5470] = FIVE;
m_pTypeTable[5471] = FIVE;
m_pTypeTable[5476] = LIVE_FOUR;
m_pTypeTable[5477] = LIVE_FOUR;
m_pTypeTable[5494] = SLEEP_FOUR;
m_pTypeTable[5495] = SLEEP_FOUR;
m_pTypeTable[5497] = SLEEP_FOUR;
m_pTypeTable[5498] = SLEEP_FOUR;
m_pTypeTable[5548] = SLEEP_FOUR;
m_pTypeTable[5549] = SLEEP_FOUR;
m_pTypeTable[5551] = SLEEP_FOUR;
m_pTypeTable[5552] = SLEEP_FOUR;
m_pTypeTable[5557] = LIVE_THREE;
m_pTypeTable[5558] = LIVE_THREE;
m_pTypeTable[5710] = FIVE;
m_pTypeTable[5711] = LIVE_FOUR;
m_pTypeTable[5713] = LIVE_FOUR;
m_pTypeTable[5714] = SLEEP_FOUR;
m_pTypeTable[5719] = SLEEP_FOUR;
m_pTypeTable[5720] = LIVE_THREE;
m_pTypeTable[5737] = SLEEP_FOUR;
m_pTypeTable[5738] = LIVE_THREE;
m_pTypeTable[5740] = LIVE_THREE;
m_pTypeTable[5741] = SLEEP_THREE;
m_pTypeTable[6197] = FIVE;
m_pTypeTable[6199] = LIVE_FOUR;
m_pTypeTable[6200] = LIVE_FOUR;
m_pTypeTable[6205] = SLEEP_FOUR;
m_pTypeTable[6206] = SLEEP_FOUR;
m_pTypeTable[6227] = LIVE_THREE;
m_pTypeTable[6277] = SLEEP_FOUR;
m_pTypeTable[6278] = SLEEP_FOUR;
m_pTypeTable[6280] = LIVE_THREE;
m_pTypeTable[6281] = LIVE_THREE;
m_pTypeTable[6286] = SLEEP_THREE;
m_pTypeTable[6287] = SLEEP_THREE;
m_pTypeTable[9868] = FIVE;
m_pTypeTable[9869] = FIVE;
m_pTypeTable[9871] = FIVE;
m_pTypeTable[9872] = FIVE;
m_pTypeTable[10084] = FIVE;
m_pTypeTable[10085] = LIVE_FOUR;
m_pTypeTable[10087] = LIVE_FOUR;
m_pTypeTable[10088] = SLEEP_FOUR;
m_pTypeTable[10093] = LIVE_FOUR;
m_pTypeTable[10094] = SLEEP_FOUR;
m_pTypeTable[10111] = SLEEP_FOUR;
m_pTypeTable[10112] = SLEEP_FOUR;
m_pTypeTable[10114] = SLEEP_FOUR;
m_pTypeTable[10115] = SLEEP_FOUR;
m_pTypeTable[10571] = FIVE;
m_pTypeTable[10573] = LIVE_FOUR;
m_pTypeTable[10574] = LIVE_FOUR;
m_pTypeTable[10579] = LIVE_FOUR;
m_pTypeTable[10580] = LIVE_FOUR;
m_pTypeTable[10597] = LIVE_FOUR;
m_pTypeTable[10598] = LIVE_FOUR;
m_pTypeTable[10600] = SLEEP_FOUR;
m_pTypeTable[10601] = SLEEP_FOUR;
m_pTypeTable[12031] = FIVE;
m_pTypeTable[12032] = FIVE;
m_pTypeTable[12037] = LIVE_FOUR;
m_pTypeTable[12038] = LIVE_FOUR;
m_pTypeTable[12055] = LIVE_FOUR;
m_pTypeTable[12056] = LIVE_FOUR;
m_pTypeTable[12058] = LIVE_FOUR;
m_pTypeTable[12059] = LIVE_FOUR;
m_pTypeTable[12271] = FIVE;
m_pTypeTable[12272] = LIVE_FOUR;
m_pTypeTable[12274] = LIVE_FOUR;
m_pTypeTable[12275] = SLEEP_FOUR;
m_pTypeTable[12280] = SLEEP_FOUR;
m_pTypeTable[12281] = LIVE_THREE;
m_pTypeTable[12298] = SLEEP_FOUR;
m_pTypeTable[12299] = LIVE_THREE;
m_pTypeTable[12301] = LIVE_THREE;
m_pTypeTable[12302] = LIVE_THREE;
m_pTypeTable[16411] = FIVE;
m_pTypeTable[16412] = FIVE;
m_pTypeTable[16429] = LIVE_FOUR;
m_pTypeTable[16430] = LIVE_FOUR;
m_pTypeTable[16432] = LIVE_FOUR;
m_pTypeTable[16433] = LIVE_FOUR;
m_pTypeTable[16645] = FIVE;
m_pTypeTable[16646] = LIVE_FOUR;
m_pTypeTable[16648] = LIVE_FOUR;
m_pTypeTable[16649] = SLEEP_FOUR;
m_pTypeTable[16654] = LIVE_FOUR;
m_pTypeTable[16655] = SLEEP_FOUR;
m_pTypeTable[16672] = SLEEP_FOUR;
m_pTypeTable[16673] = LIVE_THREE;
m_pTypeTable[16675] = LIVE_THREE;
m_pTypeTable[16676] = LIVE_THREE;
m_pTypeTable[17132] = FIVE;
m_pTypeTable[17134] = LIVE_FOUR;
m_pTypeTable[17135] = LIVE_FOUR;
m_pTypeTable[17140] = LIVE_FOUR;
m_pTypeTable[17141] = LIVE_FOUR;
m_pTypeTable[17158] = SLEEP_FOUR;
m_pTypeTable[17159] = SLEEP_FOUR;
m_pTypeTable[17161] = LIVE_THREE;
m_pTypeTable[17162] = LIVE_THREE;
m_pTypeTable[18592] = FIVE;
m_pTypeTable[18593] = FIVE;
m_pTypeTable[18598] = LIVE_FOUR;
m_pTypeTable[18599] = LIVE_FOUR;
m_pTypeTable[18616] = SLEEP_FOUR;
m_pTypeTable[18617] = SLEEP_FOUR;
m_pTypeTable[18619] = SLEEP_FOUR;
m_pTypeTable[18620] = SLEEP_FOUR;
m_pTypeTable[18832] = FIVE;
m_pTypeTable[18833] = LIVE_FOUR;
m_pTypeTable[18835] = LIVE_FOUR;
m_pTypeTable[18836] = SLEEP_FOUR;
m_pTypeTable[18841] = SLEEP_FOUR;
m_pTypeTable[18842] = LIVE_THREE;
m_pTypeTable[18859] = SLEEP_FOUR;
m_pTypeTable[18860] = LIVE_THREE;
m_pTypeTable[18862] = LIVE_THREE;
m_pTypeTable[18863] = SLEEP_THREE;
}
class MoveGenerator {
public:
struct Move {
int x = -1;
int y = -1;
bool operator==(const Move &other) const { return x == other.x && y == other.y; }
};
MoveGenerator();
void sortMoves();
void updateMoveScoreByDir(const Move &move, int dir, Scorer::Type,
Board::PIECE_COLOR);
void addMove(const Move &move);
void eraseMove(const Move &move);
bool existsMove(const Move &move);
std::vector<Move> generateMovesList(int cnt);
int playerMoveScore(const Move &move, Board::PIECE_COLOR color) const;
int maxMoveScore(const Move &move) const;
int sumPlayerScore(Board::PIECE_COLOR color) const;
const static int INVALID_MOVE_WEIGHT = -__INT32_MAX__;
public:
std::vector<Move> m_moves;
int m_recorded[Board::BOARD_SIZE][Board::BOARD_SIZE];
Scorer::Type m_dirType[2][4][Board::BOARD_SIZE][Board::BOARD_SIZE];
int m_playerMoveScore[2][Board::BOARD_SIZE][Board::BOARD_SIZE];
int m_maxScore[Board::BOARD_SIZE][Board::BOARD_SIZE];
int m_cntS4[2][Board::BOARD_SIZE][Board::BOARD_SIZE];
int m_cntL3[2][Board::BOARD_SIZE][Board::BOARD_SIZE];
int m_sumPlayerScore[2] = {0, 0};
};
MoveGenerator::MoveGenerator() {
for (int i = 0; i < Board::BOARD_SIZE; ++i) {
for (int j = 0; j < Board::BOARD_SIZE; ++j) {
m_maxScore[i][j] = INVALID_MOVE_WEIGHT;
m_recorded[i][j] = 0;
}
}
}
void MoveGenerator::sortMoves() {
std::sort(m_moves.begin(), m_moves.end(), [&](const Move &a, const Move &b) {
return m_maxScore[a.x][a.y] > m_maxScore[b.x][b.y];
});
// remove erased moves
while (m_moves.size() > 0) {
const Move &last = m_moves.back();
if (m_maxScore[last.x][last.y] != INVALID_MOVE_WEIGHT) break;
m_moves.pop_back();
m_recorded[last.x][last.y] = 0;
}
}
void MoveGenerator::updateMoveScoreByDir(const Move &move, int dir, Scorer::Type type,
Board::PIECE_COLOR player) {
if (type == m_dirType[player][dir][move.x][move.y]) return;
Scorer::Type preType = m_dirType[player][dir][move.x][move.y];
m_dirType[player][dir][move.x][move.y] = type;
int dw = Scorer::TYPE_SCORES[type] - Scorer::TYPE_SCORES[preType];
if (preType == Scorer::SLEEP_FOUR) {
m_cntS4[player][move.x][move.y]--;
if (m_cntS4[player][move.x][move.y]) {
dw -= Scorer::TYPE_SCORES[Scorer::KILL_1];
}
if (m_cntL3[player][move.x][move.y]) {
dw -= Scorer::TYPE_SCORES[Scorer::KILL_1];
}
} else if (preType == Scorer::LIVE_THREE) {
m_cntL3[player][move.x][move.y]--;
if (m_cntS4[player][move.x][move.y]) {
dw -= Scorer::TYPE_SCORES[Scorer::KILL_1];
}
if (m_cntL3[player][move.x][move.y]) {
dw -= Scorer::TYPE_SCORES[Scorer::KILL_2];
}
}
if (type == Scorer::SLEEP_FOUR) {
if (m_cntS4[player][move.x][move.y]) {
dw += Scorer::TYPE_SCORES[Scorer::KILL_1];
}
if (m_cntL3[player][move.x][move.y]) {
dw += Scorer::TYPE_SCORES[Scorer::KILL_1];
}
m_cntS4[player][move.x][move.y]++;
} else if (type == Scorer::LIVE_THREE) {
if (m_cntS4[player][move.x][move.y]) {
dw += Scorer::TYPE_SCORES[Scorer::KILL_1];
}
if (m_cntL3[player][move.x][move.y]) {
dw += Scorer::TYPE_SCORES[Scorer::KILL_2];
}
m_cntL3[player][move.x][move.y]++;
}
m_playerMoveScore[player][move.x][move.y] += dw;
m_sumPlayerScore[player] += dw;
m_maxScore[move.x][move.y] =
max(m_playerMoveScore[Board::PIECE_COLOR::WHITE][move.x][move.y],
m_playerMoveScore[Board::PIECE_COLOR::BLACK][move.x][move.y]);
}
void MoveGenerator::addMove(const Move &move) {
if (!m_recorded[move.x][move.y]) {
m_moves.push_back(move);
m_recorded[move.x][move.y] = 1;
}
int baseScore = Scorer::BASE_SCORES[move.x][move.y];
for (int i = 0; i < 4; i++) {
m_dirType[Board::PIECE_COLOR::BLACK][i][move.x][move.y] =
m_dirType[Board::PIECE_COLOR::WHITE][i][move.x][move.y] = Scorer::BASE;
}
m_playerMoveScore[Board::PIECE_COLOR::BLACK][move.x][move.y] =
m_playerMoveScore[Board::PIECE_COLOR::WHITE][move.x][move.y] = baseScore;
m_maxScore[move.x][move.y] = baseScore;
m_cntL3[Board::PIECE_COLOR::BLACK][move.x][move.y] =
m_cntL3[Board::PIECE_COLOR::WHITE][move.x][move.y] = 0;
m_cntS4[Board::PIECE_COLOR::BLACK][move.x][move.y] =
m_cntS4[Board::PIECE_COLOR::WHITE][move.x][move.y] = 0;
m_sumPlayerScore[Board::PIECE_COLOR::BLACK] += baseScore;
m_sumPlayerScore[Board::PIECE_COLOR::WHITE] += baseScore;
}
void MoveGenerator::eraseMove(const Move &move) {
m_sumPlayerScore[Board::PIECE_COLOR::BLACK] -=
m_playerMoveScore[Board::PIECE_COLOR::BLACK][move.x][move.y];
m_sumPlayerScore[Board::PIECE_COLOR::WHITE] -=
m_playerMoveScore[Board::PIECE_COLOR::WHITE][move.x][move.y];
m_maxScore[move.x][move.y] = INVALID_MOVE_WEIGHT;
}
std::vector<MoveGenerator::Move> MoveGenerator::generateMovesList(int cnt) {
sortMoves();
return cnt < m_moves.size()
? std::vector<Move>(m_moves.begin(), m_moves.begin() + cnt)
: m_moves;
}
bool MoveGenerator::existsMove(const Move &move) {
return m_maxScore[move.x][move.y] != INVALID_MOVE_WEIGHT;
}
int MoveGenerator::playerMoveScore(const Move &move, Board::PIECE_COLOR color) const {
return m_playerMoveScore[color][move.x][move.y];
}
int MoveGenerator::maxMoveScore(const Move &move) const {
return m_maxScore[move.x][move.y];
}
int MoveGenerator::sumPlayerScore(Board::PIECE_COLOR color) const {
return m_sumPlayerScore[color];
}
Zobrist::Zobrist() {
for (int i = 0; i < 2; i++) {
for (int x = 0; x < Board::BOARD_SIZE; x++) {
for (int y = 0; y < Board::BOARD_SIZE; y++) {
m_hashTable[i][x][y] = generateRandomNumber();
}
}
}
m_boardHash = generateRandomNumber();
}
unsigned long long Zobrist::generateRandomNumber() {
static std::mt19937 mt(time(NULL));
static std::uniform_int_distribution<unsigned long long> dist(0, UINT64_MAX);
return dist(mt);
}
unsigned long long Zobrist::update(int x, int y, Board::PIECE_COLOR color) {
m_boardHash ^= m_hashTable[color][x][y];
return m_boardHash;
}
class TT {
public:
enum Flag { EMPTY, EXACT, LOWER, UPPER };
struct Item {
int depth;
unsigned long long hash;
int value;
Flag flag = EMPTY;
};
TT();
~TT();
int find(unsigned long long hash, int depth, int alpha, int beta,
Board::PIECE_COLOR) const;
void insert(unsigned long long hash, int depth, int value, Flag, Board::PIECE_COLOR);
const static int LENGTH = 1 << 20;
const static int TT_NOT_HIT = __INT32_MAX__ - 1;
private:
int getHashIndex(unsigned long long hash) const { return hash & 0xFFFFF; }
Item *m_pTable[2] = {nullptr, nullptr};
};
TT::TT() {
m_pTable[0] = new Item[LENGTH];
m_pTable[1] = new Item[LENGTH];
}
TT::~TT() {
delete[] m_pTable[0];
delete[] m_pTable[1];
}
int TT::find(unsigned long long hash, int depth, int alpha, int beta,
Board::PIECE_COLOR color) const {
int idx = getHashIndex(hash);
Item &item = m_pTable[color][idx];
if (item.flag == EMPTY) return TT_NOT_HIT;
if (item.hash == hash && item.depth >= depth) {
switch (item.flag) {
case EXACT:
return item.value;
case LOWER:
if (item.value >= beta) return item.value;
break;
case UPPER:
if (item.value <= alpha) return item.value;
break;
default:
break;
}
}
return TT_NOT_HIT;
}
void TT::insert(unsigned long long hash, int depth, int value, Flag flag,
Board::PIECE_COLOR color) {
int idx = getHashIndex(hash);
Item &item = m_pTable[color][idx];
item.depth = depth;
item.hash = hash;
item.value = value;
item.flag = flag;
}
class Timer {
public:
Timer() { m_preTime = std::chrono::high_resolution_clock::now(); }
void recordCurrent() { m_preTime = std::chrono::high_resolution_clock::now(); }
int getTimePass() const {
auto now = std::chrono::high_resolution_clock::now();
auto duration =
std::chrono::duration_cast<std::chrono::milliseconds>(now - m_preTime);
return duration.count();
}
const static int TIME_OUT = __INT32_MAX__;
private:
std::chrono::high_resolution_clock::time_point m_preTime;
};
class Core {
public:
Core(Board *pBoard);
~Core() {}
void setColor(Board::PIECE_COLOR color) { m_color = color; }
MoveGenerator::Move bestMove() const { return m_bestMove; }
int bestScore() const { return m_bestScore; }
int run();
void makeMove(int x, int y, Board::PIECE_COLOR);
void cancelMove(int x, int y);
static int MIN_SEARCH_DEPTH;
static int MAX_SEARCH_DEPTH;
static int KILL_DEPTH;
static bool ITERATIVE_DEEPENING;
static int BRANCH_FACTOR;
const static int INF = __INT32_MAX__ - 100;
const static int TIME_LIMIT = 990;
private:
int negMiniMaxSearch(int depth, Board::PIECE_COLOR player, int alpha, int beta);
void updateMoveAt(int x, int y, Board::PIECE_COLOR);
void updateMoveAt(int x, int y, int dir, Board::PIECE_COLOR);
void updateMoveAround(int x, int y, Board::PIECE_COLOR);
int evaluate() const;
Board *m_pBoard = nullptr;
Timer m_timer;
TT m_TT;
Zobrist m_zobristHash;
MoveGenerator m_moveGenerator;
Scorer m_scorer;
Board::PIECE_COLOR m_color = Board::PIECE_COLOR::WHITE;
MoveGenerator::Move m_bestMove;
int m_bestScore = -__INT32_MAX__;
int iterativeDepth = 4;
};
bool Core::ITERATIVE_DEEPENING = true;
int Core::BRANCH_FACTOR = 20;
int Core::MIN_SEARCH_DEPTH = 4;
int Core::MAX_SEARCH_DEPTH = 10;
int Core::KILL_DEPTH = 4;
Core::Core(Board *pBoard) : m_pBoard(pBoard) {
if (!pBoard) return;
for (int i = 0; i < Board::BOARD_SIZE; ++i) {
for (int j = 0; j < Board::BOARD_SIZE; ++j) {
// only consider the points around the placed points
if (pBoard->getState(i, j) == Board::UNPLACE &&
pBoard->cntNeighbour(i, j) > 0) {
m_moveGenerator.addMove({i, j});
updateMoveAt(i, j, Board::PIECE_COLOR::BLACK);
updateMoveAt(i, j, Board::PIECE_COLOR::WHITE);
}
}
}
}
int Core::negMiniMaxSearch(int depth, Board::PIECE_COLOR player, int alpha, int beta) {
if (depth == 0) {
int val = evaluate();
m_TT.insert(m_pBoard->getBoardHash(), depth, val, TT::EXACT, player);
return val;
}
if (m_timer.getTimePass() >= TIME_LIMIT) {
return Timer::TIME_OUT;
}
if (depth != iterativeDepth) {
int val = m_TT.find(m_pBoard->getBoardHash(), depth, alpha, beta, player);
if (val != TT::TT_NOT_HIT) {
return val;
}
}
TT::Flag flag = TT::UPPER;
std::vector<MoveGenerator::Move> moves =
m_moveGenerator.generateMovesList(BRANCH_FACTOR);
int cntMoves = moves.size();
Board::PIECE_COLOR opponent = static_cast<Board::PIECE_COLOR>(player ^ 1);
bool opponentHasFive = false;
int i = 0;
while (i < cntMoves) {
// only consider the moves with score higher than FIVE
auto &move = moves[i];
int maxMoveScore = m_moveGenerator.maxMoveScore(move);
if (maxMoveScore < Scorer::TYPE_SCORES[Scorer::FIVE]) {
break;
}
int playerMoveScore = m_moveGenerator.playerMoveScore(move, player);
if (playerMoveScore >= Scorer::TYPE_SCORES[Scorer::FIVE]) {
// win
int val = INF + depth + KILL_DEPTH;
if (depth == iterativeDepth && val > m_bestScore) {
m_bestMove = move;
m_bestScore = val;
}
if (val >= beta) {
m_TT.insert(m_pBoard->getBoardHash(), depth, beta, TT::LOWER, player);
return val;
}
if (val > alpha) {
flag = TT::EXACT;
alpha = val;
}
m_TT.insert(m_pBoard->getBoardHash(), depth, alpha, flag, player);
return alpha;
} else {
opponentHasFive = true;
}
i++;
}
if (opponentHasFive) {
// must block the opponent's FIVE
i--;
auto &move = moves[i];
makeMove(move.x, move.y, player);
int val = -negMiniMaxSearch(depth - 1, opponent, -beta, -alpha);
cancelMove(move.x, move.y);
if (val == -Timer::TIME_OUT) return Timer::TIME_OUT;
if (depth == iterativeDepth && val > m_bestScore) {
m_bestMove = move;
m_bestScore = val;
}
if (val >= beta) {
m_TT.insert(m_pBoard->getBoardHash(), depth, beta, TT::LOWER, player);
return val;
}
if (val > alpha) {
flag = TT::EXACT;
alpha = val;
}
} else {
bool fFoundPv = false;
while (i < cntMoves) {
auto &move = moves[i];
int val = alpha;
if (m_moveGenerator.playerMoveScore(move, player) >=
Scorer::TYPE_SCORES[Scorer::LIVE_FOUR]) {
val = INF + depth + KILL_DEPTH - 1;
if (depth == iterativeDepth && val > m_bestScore) {
m_bestMove = move;
m_bestScore = val;
}
if (val >= beta) {
m_TT.insert(m_pBoard->getBoardHash(), depth, beta, TT::LOWER, player);
return val;
}
if (val > alpha) {
flag = TT::EXACT;
fFoundPv = true;
alpha = val;
}
m_TT.insert(m_pBoard->getBoardHash(), depth, alpha, flag, player);
return alpha;
} else {
makeMove(move.x, move.y, player);
if (fFoundPv) {
val = -negMiniMaxSearch(depth - 1, opponent, -alpha - 1, -alpha);
if ((val > alpha) && (val < beta)) {
val = -negMiniMaxSearch(depth - 1, opponent, -beta, -alpha);
}
} else {
val = -negMiniMaxSearch(depth - 1, opponent, -beta, -alpha);
}
cancelMove(move.x, move.y);
if (val == -Timer::TIME_OUT) return Timer::TIME_OUT;
}
if (depth == iterativeDepth && val > m_bestScore) {
m_bestMove = move;
m_bestScore = val;
}
if (val >= beta) {
m_TT.insert(m_pBoard->getBoardHash(), depth, beta, TT::LOWER, player);
return val;