34-kangrae-jo

kangrae-jo/Graph/34-kangrae-jo.cpp

@@ -0,0 +1,56 @@
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+const int INF = 1e9;
+
+bool solution(vector<vector<pair<int,int>>>& graph, int N) {
+    vector<int> dist(N + 1, 0);         
+    for (int i = 1; i <= N; i++) {
+        bool updated = false;
+        for (int from = 1; from <= N; from++) {
+            for (auto [to, cost] : graph[from]) {
+                if (dist[to] > dist[from] + cost) {
+                    dist[to] = dist[from] + cost;
+                    updated = true;
+                    if (i == N) return true;
+                }
+            }
+        }
+        if (!updated) break;   
+    }
+
+    return false;
+}
+
+int main() {
+    int TC;
+    cin >> TC;
+
+    while (TC--) {
+        int N, M, W;
+        cin >> N >> M >> W;
+
+        vector<vector<pair<int, int>>> graph(N + 1);
+        for (int i = 0; i < M; i++) {
+            int S, E, T;
+            cin >> S >> E >> T;
+
+            graph[S].push_back({E, T});
+            graph[E].push_back({S, T});
+        }
+
+        for (int i = 0; i < W; i++) {
+            int S, E, T;
+            cin >> S >> E >> T;
+
+            graph[S].push_back({E, -T});
+        }
+
+        if (solution(graph, N)) cout << "YES\n";
+        else cout << "NO\n";
+    }
+
+    return 0;
+}

kangrae-jo/README.md

@@ -32,4 +32,5 @@
 | 28차시 | 2024.06.10 |  BFS  | [경주로 건설](https://school.programmers.co.kr/learn/courses/30/lessons/67259)|[#110](https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/110)|
 | 29차시 | 2024.06.19 |  TRIE  | [[3차] 자동완성](https://school.programmers.co.kr/learn/courses/30/lessons/17685)|[#114](https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/114)|
 | 30차시 | 2024.07.18 |  BFS  | [치즈](https://www.acmicpc.net/problem/2638)|[#117](https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/117)|
-| 31차시 | 2024.07.31 |  Prefix Sum  | [두 배열의 합](https://www.acmicpc.net/problem/2143)|[#122](https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/122)|
+| 31차시 | 2024.07.31 |  Prefix Sum  | [두 배열의 합](https://www.acmicpc.net/problem/2143)|[#122](https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/122)|
+| 34차시 | 2024.08.28 |  Graph  | [웜홀](https://www.acmicpc.net/problem/1865)|[#122](https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/136)|