2024-07-28 부녀회장이 될테야

oesnuj/DP/2775.cpp

@@ -0,0 +1,53 @@
+/*풀이1 재귀만 이용*/
+//#include <iostream>
+//using namespace std;
+//
+//int calc(int k, int n) {
+//    if (k == 0) return n;
+//    int sum = 0;
+//    for (int i = n; i > 0; i--) {
+//        sum += calc(k - 1, i);
+//    }
+//    return sum;
+//}
+//
+//int main() 
+//{
+//    int T, k, n;
+//    cin >> T;
+//    while (T--) {
+//        cin >> k >> n;
+//        cout << calc(k, n) << "\n";
+//    }
+//    return 0;
+//}
+
+/*풀이2, 재귀 + DP*/
+#include <iostream>
+#include <vector>
+using namespace std;
+
+vector<vector<int>> dp;
+
+int calc(int k, int n) {
+    if (k == 0) return n;
+    if (dp[k][n] != -1) return dp[k][n]; // 이미 계산된 값이면 반환
+
+    int sum = 0;
+    for (int i = n; i > 0; i--) {
+        sum += calc(k - 1, i);
+    }
+    return dp[k][n] = sum; // 계산된 값을 저장하고 반환
+}
+
+int main()
+{
+    int T, k, n;
+    cin >> T;
+    while (T--) {
+        cin >> k >> n;
+        dp = vector<vector<int>>(k + 1, vector<int>(n + 1, -1)); //케이스별 DP 테이블 초기화
+        cout << calc(k, n) << "\n";
+    }
+    return 0;
+}

oesnuj/README.md

@@ -14,4 +14,5 @@
 | 10차시 | 2024.07.04 | 구현 | [상어초등학교](https://www.acmicpc.net/problem/21608)  | [#34](https://github.com/AlgoLeadMe/AlgoLeadMe-10/pull/34) |
 | 11차시 | 2024.07.18 | 이분 탐색 | [랜선 자르기](https://www.acmicpc.net/problem/1654)  | [#38](https://github.com/AlgoLeadMe/AlgoLeadMe-10/pull/38) |
 | 12차시 | 2024.07.24 | 재귀 | [하노이 탑](https://www.acmicpc.net/problem/1914)  | [#41](https://github.com/AlgoLeadMe/AlgoLeadMe-10/pull/41) |
+| 13차시 | 2024.07.28 | DP | [부녀회장이 될테야](https://www.acmicpc.net/problem/2775)  | [#44](https://github.com/AlgoLeadMe/AlgoLeadMe-10/pull/44) |
 ---