Submission #914091

#	Time	Username	Problem	Language	Result	Execution time	Memory
914091		1075508020060209tc	Senior Postmen (BOI14_postmen)	C++14	100 / 100	424 ms	68464 KiB

postmen

#pragma GCC optimize("Ofast")
#include<bits/stdc++.h>
using namespace std;
//#define int long long
#define X first
#define Y second
#define SZ(x) (int)(x).size()

int n;int m;
int ar[500005];

vector<int>e[500005];
int eit[500005];
//bool vis[500005];
//bool visv[500005];
bitset<500005>vis;
bitset<500005>visv;
int id;

int ssz;
int stk[500005];
void dfs(int nw){
for(;eit[nw]<e[nw].size();eit[nw]++){
    id=e[nw][eit[nw]];
    if(vis[id]){continue;}
    vis[id]=1;
    int v=ar[id]^nw;
    dfs(v);
}

    int v=nw;
    if(visv[v]){
        while(1){
            cout<<stk[ssz-1];
            if(stk[ssz-1]==v){cout<<'\n';break;}else{
                cout<<' ';
            }
            visv[stk[ssz-1]]=0;
            ssz--;
        }
    }else{
        visv[v]=1;
        stk[ssz++]=v;
    }
}


signed main(){
cin.tie(0);
ios_base::sync_with_stdio(0);
cin>>n>>m;
for(int i=1;i<=m;i++){
    int b;
    cin>>ar[i]>>b;
    e[ar[i]].push_back(i);
    e[b].push_back(i);
    ar[i]^=b;
}
dfs(1);
return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'void dfs(int)':
postmen.cpp:23:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 | for(;eit[nw]<e[nw].size();eit[nw]++){
      |      ~~~~~~~^~~~~~~~~~~~~

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