Submission #565160

#	Time	Username	Problem	Language	Result	Execution time	Memory
565160		SSRS	Election Campaign (JOI15_election_campaign)	C++14	0 / 100	1085 ms	11436 KiB

election_campaign

#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<vector<pair<int, int>>> E(N);
  for (int i = 0; i < N - 1; i++){
    int X, Y;
    cin >> X >> Y;
    X--;
    Y--;
    E[X].push_back(make_pair(i, Y));
    E[Y].push_back(make_pair(i, X));
  }
  int M;
  cin >> M;
  vector<int> A(M), B(M), C(M);
  for (int i = 0; i < M; i++){
    cin >> A[i] >> B[i] >> C[i];
    A[i]--;
    B[i]--;
  }
  vector<int> S(N - 1, 0);
  for (int i = 0; i < M; i++){
    vector<int> p(N, -1);
    vector<int> e(N);
    queue<int> Q;
    Q.push(A[i]);
    while (!Q.empty()){
      int v = Q.front();
      Q.pop();
      for (auto P : E[v]){
        int w = P.second;
        if (w != p[v]){
          p[w] = v;
          e[w] = P.first;
          Q.push(w);
        }
      }
    }
    int v = B[i];
    while (v != A[i]){
      S[e[v]] |= 1 << i;
      v = p[v];
    }
  }
  vector<vector<bool>> ok(M, vector<bool>(M, 	true));
  for (int i = 0; i < N - 1; i++){
    for (int j = 0; j < M; j++){
      for (int k = j + 1; k < M; k++){
        if ((S[i] >> j & 1) == 1 && (S[i] >> k & 1) == 1){
          ok[j][k] = false;
        }
      }
    }
  }
  int ans = 0;
  for (int i = 0; i < (1 << M); i++){
    bool ok2 = true;
    for (int j = 0; j < M; j++){
      for (int k = j + 1; k < M; k++){
        if ((i >> j & 1) == 1 && (i >> k & 1) == 1 && !ok[j][k]){
          ok2 = false;
        }
      }
    }
    if (ok2){
    	int sum = 0;
    	for (int j = 0; j < M; j++){
    	  if ((i >> j & 1) == 1){
    	    sum += C[j];
    	  }
    	}
    	ans = max(ans, sum);
    }
  }
  cout << ans << endl;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 5
• Subtask 3: 0 / 5
• Subtask 4: 0 / 30
• Subtask 5: 0 / 10
• Subtask 6: 0 / 40