제출 #537233

#제출 시각아이디문제언어결과실행 시간메모리
537233LucaDantas구슬과 끈 (APIO14_beads)C++17
28 / 100
1075 ms1108 KiB
// provavelmente vai dar errado, e com certeza da tle nas maiores #include <bits/stdc++.h> using namespace std; constexpr int maxn = 1e4+10; // subtask mudar vector<pair<int,int>> g[maxn]; int dp[maxn][2]; // posso retornar com o pai livre ou sem o pai livre void dfs(int u, int p, int peso_pai) { for(auto [v, w] : g[u]) if(v != p) { dfs(v, u, w); dp[u][1] = max(dp[u][1], dp[v][0] + w + peso_pai - max(dp[v][0], dp[v][1])); dp[u][0] += max(dp[v][0], dp[v][1]); } dp[u][1] += dp[u][0]; // printf("%d -> %d %d\n", u, dp[u][0], dp[u][1]); } int main() { int n; scanf("%d", &n); for(int i = 1, a, b, w; i < n; i++) scanf("%d %d %d", &a, &b, &w), g[a].push_back({b, w}), g[b].push_back({a, w}); // comeco de uma folha pq é mais facil int ans = 0; for(int i = 1; i <= n; i++) if(g[i].size() == 1) dfs(i, 0, 0), ans = max(ans, dp[i][0]), memset(dp, 0, sizeof dp); printf("%d\n", ans); /* int st = -1; for(int i = 1; i < n; i++) if(g[i].size() == 1) st = i; dfs(st, 0, 0); printf("%d\n", dp[st][0]); */ }

컴파일 시 표준 에러 (stderr) 메시지

beads.cpp: In function 'int main()':
beads.cpp:22:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |  int n; scanf("%d", &n);
      |         ~~~~~^~~~~~~~~~
beads.cpp:24:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |   scanf("%d %d %d", &a, &b, &w), g[a].push_back({b, w}), g[b].push_back({a, w});
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
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