제출 #514856

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
514856	2022-01-18 15:28:27	ACE_	Power Plant (JOI20_power)	C++14	100 / 100	284 ms	28860 KiB

power

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#include<bits/stdc++.h>
using namespace std;
const int maxn = 2e5 + 5;
int t, dp[maxn], n, ans;
vector<int> V[maxn];
string s;
void dfs(int u,int p) {
  int m = 0, all = 0;
  for(int i = 0; i < V[u].size(); i++) {
    if(V[u][i] == p) continue;
    dfs(V[u][i], u);
    all += dp[V[u][i]];
    m = max(m, dp[V[u][i]]);
  }
  dp[u] = max(m - (s[u] == '1'), 0 + (s[u] == '1'));
  dp[u] = max(dp[u], all  - (s[u] == '1'));
  ans = max(ans, m + (s[u] == '1')); ans = max(ans, dp[u]);
}
main(){
  cin >> n;
  for(int i = 2; i <= n; i++) {
    int u,v;
    cin >> u >> v;
    V[u].push_back(v); V[v].push_back(u);
  }
  cin >> s; s = '#' + s;
  dfs(1, 0);
  cout << max(ans, dp[1]);
}
 
 
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컴파일 시 표준 에러 (stderr) 메시지

power.cpp: In function 'void dfs(int, int)':
power.cpp:9:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |  for(int i = 0; i < V[u].size(); i++) {
      |                 ~~^~~~~~~~~~~~~
power.cpp: At global scope:
power.cpp:19:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   19 | main(){
      | ^~~~

• Subtask 1: 6 / 6
• Subtask 2: 41 / 41
• Subtask 3: 53 / 53