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2294_동전2.cpp

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+#include<iostream>
+#include<algorithm>
+using namespace std;
+
+constexpr int MAX = 101;
+constexpr int INF = 100000000;
+
+int N, K;
+int DP[10001];
+int coin[MAX];
+
+int main(void)
+{
+	DP[0] = 0;
+
+	cin >> N >> K;
+
+	for (int i = 1; i <= N; i++)
+	{
+		cin >> coin[i];
+	}
+
+	for (int i = 1; i <= K; i++)
+	{
+		DP[i] = INF;
+	}
+
+	for(int i = 1; i <= N; i++)
+	{
+		for (int j = coin[i]; j <= K; j++)
+		{
+			if (DP[j - coin[i]] + 1 < DP[j])
+			{
+				DP[j] = DP[j - coin[i]] + 1;
+			}
+		}
+	}
+
+	//아깝다.. 출력이 불가능한경우에도 체크해줘야한다. 이걸 못봤다..
+	if (DP[K] == INF)
+	{
+		cout << -1;
+	}
+	else
+	{
+		cout << DP[K];
+	}
+
+	return 0;
+}