oj.uz

답안 #783600

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
783600 2023-07-15T05:17:39 Z christinelynn The Xana coup (BOI21_xanadu) C++17
5 / 100
 1000 ms 7272 KB 
#include<bits/stdc++.h>
#define int long long
using namespace std;
const int MAX=1e9;
int n;
vector<vector<int>> adj;
bool can(vector<int> c, int mask) {
  int i=0;
  while(mask) {
    if(mask&1) {
      c[i]^=1;
      for(int p : adj[i]) c[p]^=1;
    }
    mask>>=1; i++;
  }
  int sum=0;
  for(int p : c) sum+=p;
  return sum==0;
}
signed main() {
  ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  cin >> n; adj.resize(n);
  for(int i=1; i<n; i++) {
    int u, v; cin >> u >> v; --u; --v;
    adj[u].push_back(v);
    adj[v].push_back(u);
  }
  int ans=MAX;
  vector<int> c(n); for(int &p : c) cin >> p;
  for(int i=0; i<(1 << n); i++) 
    if(can(c, i)) ans=min(ans, (int)__builtin_popcount(i)); 
  if(ans>=MAX) cout << "impossible\n";
  else cout << ans << '\n';
    return 0;
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 212 KB Output is correct
2 Correct 2 ms 212 KB Output is correct
3 Correct 114 ms 212 KB Output is correct
4 Correct 117 ms 300 KB Output is correct
5 Correct 113 ms 212 KB Output is correct

Subtask #2
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 212 KB Output is correct
2 Correct 2 ms 212 KB Output is correct
3 Correct 114 ms 212 KB Output is correct
4 Correct 117 ms 300 KB Output is correct
5 Correct 113 ms 212 KB Output is correct
6 Correct 14 ms 212 KB Output is correct
7 Correct 2 ms 280 KB Output is correct
8 Correct 112 ms 300 KB Output is correct
9 Correct 117 ms 212 KB Output is correct
10 Correct 128 ms 300 KB Output is correct
11 Incorrect 1 ms 212 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1081 ms 7272 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1075 ms 7216 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 212 KB Output is correct
2 Correct 2 ms 212 KB Output is correct
3 Correct 114 ms 212 KB Output is correct
4 Correct 117 ms 300 KB Output is correct
5 Correct 113 ms 212 KB Output is correct
6 Correct 14 ms 212 KB Output is correct
7 Correct 2 ms 280 KB Output is correct
8 Correct 112 ms 300 KB Output is correct
9 Correct 117 ms 212 KB Output is correct
10 Correct 128 ms 300 KB Output is correct
11 Incorrect 1 ms 212 KB Output isn't correct
12 Halted 0 ms 0 KB -