Submission #124584

#	Time	Username	Problem	Language	Result	Execution time	Memory
124584		deinfreund	Sightseeing (NOI14_sightseeing)	C++14	15 / 25	3538 ms	114080 KiB

sightseeing

    #include <bits/stdc++.h>
     
    using namespace std;
     
    vector<vector<pair<int, int>> > conns;
     
    int main(){
      int nodes, edges, targets;
      cin >> nodes >> edges >> targets;
      conns.resize(nodes);
      ios_base::sync_with_stdio(0);
      cin.tie(0);
      vector<pair<int, int>> edgeSort;
      for (int i = 0; i < edges; i++){
        int a, b, c;
        cin >> a >> b>> c;
        a--; b--; c *= -1;
        conns[a].push_back({c,b});
        conns[b].push_back({c, a});
      }
      for (int i = 0 ; i < nodes; i++){
        sort(conns[i].begin(), conns[i].end());
      }
      
      int remaining = 0;
      vector<bool> needed(nodes, 0);
      vector<int> trg;
      for (int i = 0 ; i < targets; i++){
        remaining ++;
        int a;
        cin >> a; a--;
        needed[a] = 1;
        trg.push_back(a);
      }
      vector<long long> best(nodes, 1000000000000000000LL);
      priority_queue<pair<long long, int>> pq;
      pq.push({-1000000000000000000LL,0});
      while (true){
        int pos, cost;
        do{
          pos = pq.top().second;
          cost = -pq.top().first;
          pq.pop();
        }while(cost > best[pos]);
        if (needed[pos]) remaining --;
        if (remaining == 0) break;
        for (int i = 0; i < conns[pos].size(); i++){
          int c = max(cost, conns[pos][i].first);
          if (c < best[conns[pos][i].second]){
    	best[conns[pos][i].second] = c;
    	pq.push({-c, conns[pos][i].second});
          }
        }
      }
      for (int i = 0; i < targets; i++){
        cout << -best[trg[i]] << endl;
      }
    }

Compilation message (stderr)

sightseeing.cpp: In function 'int main()':
sightseeing.cpp:47:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < conns[pos].size(); i++){
                         ~~^~~~~~~~~~~~~~~~~~~

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