제출 #169981

#제출 시각아이디문제언어결과실행 시간메모리
169981ZwariowanyMarcin구슬과 끈 (APIO14_beads)C++14
0 / 100
7 ms4984 KiB
#include <bits/stdc++.h> #define fi first #define se second #define mp make_pair #define ss(x) (int) x.size() #define pb push_back #define ll long long #define cat(x) cerr << #x << " = " << x << endl #define FOR(i, n) for(int i = 0; i < n; ++i) using namespace std; const int nax = 2e5 + 111; const ll inf = 1e18; int n; int a, b, c; vector <pair<int,int>> v[nax]; ll dp[nax][3]; void dfs(int u, int p, int cost) { dp[u][0] = 0; dp[u][1] = -inf; ll sum = 0; vector <ll> opt; for(auto it : v[u]) if(it.fi != p) { dfs(it.fi, u, it.se); sum += dp[it.fi][2]; opt.pb(it.se + dp[it.fi][0] - dp[it.fi][2]); } sort(opt.begin(), opt.end()); reverse(opt.begin(), opt.end()); dp[u][0] = max(dp[u][0], sum); if(ss(opt) > 1) dp[u][0] = max(dp[u][0], sum + opt[0] + opt[1]); if(ss(opt) > 0 && p != 0) dp[u][1] = max(dp[u][1], sum + opt[0] + cost); dp[u][2] = max(dp[u][0], dp[u][1]); } int main() { scanf("%d", &n); for(int i = 1; i < n; ++i) { scanf("%d %d %d", &a, &b, &c); v[a].pb(mp(b, c)); v[b].pb(mp(a, c)); } dfs(1, 0, 0); printf("%lld", dp[1][0]); return 0; }

컴파일 시 표준 에러 (stderr) 메시지

beads.cpp: In function 'int main()':
beads.cpp:46:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
beads.cpp:48:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d", &a, &b, &c);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
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