双色地砖行走_POJ1979-BFS_DFS

FuBin29 · Apr 20, 2020 · 200b885 · 200b885
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diff --git a/Algorithm.sln b/Algorithm.sln
@@ -36,6 +36,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Lake_Counting_POJ2386-DFS",
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 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "迷宫最短路径-BFS", "迷宫最短路径-BFS\迷宫最短路径-BFS.vcxproj", "{3E14D7A9-4C77-4126-B9FB-99429AC9FD8A}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "双色地砖行走_POJ1979-BFS_DFS", "双色地砖行走_POJ1979-BFS_DFS\双色地砖行走_POJ1979-BFS_DFS.vcxproj", "{B6A8E036-6E8B-49E3-9E3F-63035F29564D}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64
@@ -148,6 +150,14 @@ Global
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diff --git a/Readme.md b/Readme.md
@@ -8,6 +8,7 @@
 |最优二叉搜索树-DP||
 |最长单调递增子序列-DP||
 |Lake_Counting_POJ2386-DFS|二维字符数组，一个W周围8个空间有W，则相连为一个水坑，对水坑计数。|
+|双色地砖行走_POJ1979-BFS_DFS|二维字符数组，其中有双色的地砖，一个人在起点出发只能走一种颜色，求一共可以走多少块地砖，使用BFS和DFS均可。|
 |Eight_Puzzle-BFS||
 |迷宫最短路径-BFS|在一个迷宫里从起点到终点最少走多少步|
 |Nqueens-局部快速搜索||

diff --git a/双色地砖行走_POJ1979-BFS_DFS/BFS.cpp b/双色地砖行走_POJ1979-BFS_DFS/BFS.cpp
@@ -0,0 +1,44 @@
+#include<iostream>
+#include<queue>
+
+using namespace std;
+
+extern int W, H;
+extern char room[20][21];
+extern int sx, sy;
+extern bool arrive[20][20];
+extern int dx[4], dy[4];
+
+typedef pair<int, int> P;
+int BFS()
+{
+	queue<P> que;
+	for (int i = 0; i < H; i++)
+		for (int j = 0; j < W; j++)
+			arrive[i][j] = false;
+	arrive[sx][sy] = true;
+	que.push(P(sx, sy));
+	int ans = 1;
+
+	while (que.size())
+	{
+		P p = que.front();
+		que.pop();
+
+		for (int i = 0; i < 4; i++)
+		{
+			int nx = p.first + dx[i];
+			int ny = p.second + dy[i];
+
+			if (nx >= 0 && nx < H && ny >= 0 && ny < W && room[nx][ny] != '#' && arrive[nx][ny] == false)
+			{
+				que.push(P(nx, ny));
+				arrive[nx][ny] = true;
+				ans++;
+			}
+		}
+	}
+
+	return ans;
+}
+
diff --git a/双色地砖行走_POJ1979-BFS_DFS/DFS.cpp b/双色地砖行走_POJ1979-BFS_DFS/DFS.cpp
@@ -0,0 +1,43 @@
+#include<iostream>
+#include<stack>
+
+using namespace std;
+
+extern int W, H;
+extern char room[20][21];
+extern int sx, sy;
+extern bool arrive[20][20];
+extern int dx[4], dy[4];
+
+typedef pair<int, int> P;
+int DFS()
+{
+	stack<P> sta;
+	for (int i = 0; i < H; i++)
+		for (int j = 0; j < W; j++)
+			arrive[i][j] = false;
+	arrive[sx][sy] = true;
+	sta.push(P(sx, sy));
+	int ans = 1;
+
+	while (sta.size())
+	{
+		P p = sta.top();
+		sta.pop();
+
+		for (int i = 0; i < 4; i++)
+		{
+			int nx = p.first + dx[i];
+			int ny = p.second + dy[i];
+
+			if (nx >= 0 && nx < H && ny >= 0 && ny < W && room[nx][ny] != '#' && arrive[nx][ny] == false)
+			{
+				sta.push(P(nx, ny));
+				arrive[nx][ny] = true;
+				ans++;
+			}
+		}
+	}
+
+	return ans;
+}
diff --git a/双色地砖行走_POJ1979-BFS_DFS/main.cpp b/双色地砖行走_POJ1979-BFS_DFS/main.cpp
@@ -0,0 +1,42 @@
+#include<iostream>
+#include<queue>
+#include<stack>
+
+using namespace std;
+
+int W, H;
+char room[20][21];
+int sx, sy;
+bool arrive[20][20];
+int dx[4] = { 1, 0, -1, 0 }, dy[4] = { 0, 1, 0, -1 };
+
+int BFS();
+int DFS();
+
+int main()
+{
+	while (true)
+	{
+		cin >> W >> H;
+		if (W == 0 && H == 0)
+			break;
+
+		for (int i = 0; i < H; i++)
+			for (int j = 0; j < W; j++)
+			{
+				cin >> room[i][j];
+				if (room[i][j] == '@')
+				{
+					sx = i;
+					sy = j;
+				}
+			}
+
+		//int ans = BFS();
+		int ans = DFS();
+		cout << ans << endl;
+	}
+
+	return 0;
+}
+
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