Submission #603987

#	Time	Username	Problem	Language	Result	Execution time	Memory
603987		Ahmadsm2005	Stranded Far From Home (BOI22_island)	C++17	10 / 100	1095 ms	16264 KiB

island

#include <bits/stdc++.h>
//#define int long long
using namespace std;
int N,M,V[200001],X,Y,VIS[200001];
int R[200001],R2[200001];
vector<int>edges[200001];
void BFS(int X){
    for(int i = 0; i < N; i += 1)VIS[i] = 0;
    priority_queue<pair<int,int>>Q;
    int CNT = V[X];
    Q.push({0,X});
    vector<int>UU;
    while(Q.size()){
        int F = Q.top().second,S = -Q.top().first;
        Q.pop();
        if(VIS[F])continue;
        if((S > CNT) || (R[F] == 0 && R2[F] >= CNT)){
            R[X] = 0;
            R2[X] = CNT;
            return;
        }
        if(R[F] == 1)break;
        VIS[F] = 1;
        CNT += S;
        CNT = min(CNT,(int)1e9);
        for(int i = 0; i < edges[F].size(); i += 1){
            Q.push({-V[edges[F][i]],edges[F][i]});
        }
    }
    R[X] = 1;
}
int32_t main()
{
    cin.tie(0),iostream::sync_with_stdio(0);
    cin>>N>>M;
    vector<int>RR;
    mt19937 rng(2005);
    for(int i = 0; i < N; i += 1)RR.push_back(i);
    shuffle(RR.begin(),RR.end(),rng);
    for(int i = 0; i < N; i += 1){
        cin>>V[i];
        R[i] = -1;
    }
    for(int i = 0; i < M; i += 1){
        cin>>X>>Y;
        edges[X - 1].push_back(Y - 1),edges[Y - 1].push_back(X - 1);
    }
    for(int i = 0; i < N; i += 1){
        BFS(RR[i]);
    }
    for(int i = 0; i < N; i += 1)cout<<R[i];
}

Compilation message (stderr)

island.cpp: In function 'void BFS(int)':
island.cpp:26:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |         for(int i = 0; i < edges[F].size(); i += 1){
      |                        ~~^~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 35