Submission #603515

#	Time	Username	Problem	Language	Result	Execution time	Memory
603515		almothana05	Stranded Far From Home (BOI22_island)	C++14	20 / 100	337 ms	33872 KiB

island

#include<bits/stdc++.h>
#define mod 1000000007
using namespace std;
queue<long long>q;
priority_queue<pair<long long, long long> >pri;
vector<long long>gr[200100];
long long num[200010] , sub[200010]  ,vis[200100] , erg[200100];
long long dfs(long long x){
    vis[x] = 1;
    for(long long i = 0 ; i < gr[x].size() ; i++){
        long long kind = gr[x][i];
        if(vis[kind] == 0){
            sub[x] += dfs(kind);
        }
    }
    return sub[x];
}
int main(){
    long long menge , numm = 0, nummer  , ed;
    cin >> menge >> ed;
    for(long long i = 0 ;i < menge ; i++){
        cin >> numm;
        num[i + 1] = numm;
        sub[i + 1] = num[i + 1];
    }
    for(long long i = 0 ; i< ed ; i++){
        cin >> numm >> nummer;
        gr[numm].push_back(nummer);
        gr[nummer].push_back(numm);
    }
    if(menge > 2000){
        dfs(1);
        erg[1] = 1;
        for(long long i = 1 ; i <=menge ; i++){
            for(long long j = 0 ; j < gr[i].size() ; j++){
                long long kind = gr[i][j];
                if(kind < i && erg[kind] == 1 && sub[i] >= num[kind]){
                    erg[i] = 1;
                }
            }
        }
        for(long long i = 1; i <= menge ; i++){
            cout << erg[i];
        }
        return 0;
    }
    for(long long i = 1 ; i <= menge ; i++){
        long long fl = 1;
        long long cmp = 0;
        vis[i] = 1;
        q.push(i);
        while(q.size()){
            long long jet = q.front();
            q.pop();
            cmp += num[jet];
            for(long long i = 0 ; i < gr[jet].size() ; i++){
                long long kind = gr[jet][i];
                pri.push({-num[kind] , kind });
            }
            while(pri.size() && -pri.top().first <= cmp){
                if(vis[pri.top().second] == 0){
                    vis[pri.top().second] = 1;
                    q.push(pri.top().second);
                }
                pri.pop();
            }
        }
        while(pri.size()){
            pri.pop();
        }
        for(long long j = 1 ; j <=menge ; j++){
            if(vis[j] == 0){
                fl = 0;
            }
            vis[j] = 0;
        }
        cout << fl ;
    }
}

Compilation message (stderr)

island.cpp: In function 'long long int dfs(long long int)':
island.cpp:10:29: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(long long i = 0 ; i < gr[x].size() ; i++){
      |                           ~~^~~~~~~~~~~~~~
island.cpp: In function 'int main()':
island.cpp:35:37: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |             for(long long j = 0 ; j < gr[i].size() ; j++){
      |                                   ~~^~~~~~~~~~~~~~
island.cpp:56:37: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |             for(long long i = 0 ; i < gr[jet].size() ; i++){
      |                                   ~~^~~~~~~~~~~~~~~~

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