Submission #755472

#	Time	Username	Problem	Language	Result	Execution time	Memory
755472		irmuun	Senior Postmen (BOI14_postmen)	C++17	55 / 100	523 ms	101660 KiB

postmen

#include<bits/stdc++.h>

using namespace std;
 
#define pb push_back
#define ll long long
#define ff first
#define ss second
#define all(s) s.begin(),s.end()

int main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    int n,m;
    cin>>n>>m;
    set<int>adj[n+1];
    vector<int>used(n+1,0);
    for(int i=1;i<=m;i++){
        int u,v;
        cin>>u>>v;
        adj[u].insert(v);
        adj[v].insert(u);
    }
    vector<int>ord;
    function <void(int)> dfs=[&](int x){
        ord.pb(x);
        if(adj[x].size()==0){
            return;
        }
        int y=*adj[x].begin();
        adj[x].erase(y);
        adj[y].erase(x);
        dfs(y);
    };
    for(int i=1;i<=n;i++){
        if(adj[i].size()>0){
            dfs(i);
        }
    }
    stack<int>v;
    for(int i=0;i<ord.size();i++){
        if(used[ord[i]]==0){
            used[ord[i]]=1;
            v.push(ord[i]);
        }
        else{
            int x=ord[i];
            cout<<x<<' ';
            while(!v.empty()){
                int y=v.top();
                if(x!=y){
                    cout<<y<<' ';
                    v.pop();
                    used[y]=0;
                }
                else{
                    break;
                }
            }
            cout<<"\n";
        }
    }
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:40:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |     for(int i=0;i<ord.size();i++){
      |                 ~^~~~~~~~~~~

• Subtask 1: 38 / 38
• Subtask 2: 17 / 17
• Subtask 3: 0 / 45