Submission #912881

#	Time	Username	Problem	Language	Result	Execution time	Memory
912881		1075508020060209tc	Senior Postmen (BOI14_postmen)	C++14	55 / 100	518 ms	78296 KiB

postmen

#pragma GCC optimize("O3")
#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];
int br[500005];
vector<int>e[500005];
int eit[500005];
int vis[500005];
int visv[500005];
vector<int>ans;
void dfs(int nw){
for(;eit[nw]<e[nw].size();eit[nw]++){
    int id=e[nw][eit[nw]];
    if(vis[id]){continue;}
    vis[id]=1;
    int v=ar[id]^br[id]^nw;
    dfs(v);
}
ans.push_back(nw);
}
vector<vector<int>>fans;

signed main(){
cin.tie(0);
ios_base::sync_with_stdio(0);
cin>>n>>m;
for(int i=1;i<=m;i++){
    cin>>ar[i]>>br[i];
    e[ar[i]].push_back(i);
    e[br[i]].push_back(i);
}
dfs(1);
vector<int>stk;
for(int i=0;i<ans.size();i++){
    vector<int>vc;
    int v=ans[i];
    if(visv[v]){
        while(1){
            vc.push_back(stk.back());
            if(stk.back()==v){break;}
            visv[stk.back()]=0;
            stk.pop_back();
        }
        fans.push_back(vc);
    }else{
        visv[v]=1;
        stk.push_back(v);
    }
}
for(int i=0;i<fans.size();i++){
    for(int j=0;j<fans[i].size();j++){
        cout<<fans[i][j]<<" ";
    }cout<<"\n";
}


}

Compilation message (stderr)

postmen.cpp: In function 'void dfs(int)':
postmen.cpp:18:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 | for(;eit[nw]<e[nw].size();eit[nw]++){
      |      ~~~~~~~^~~~~~~~~~~~~
postmen.cpp: In function 'int main()':
postmen.cpp:40:14: 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<ans.size();i++){
      |             ~^~~~~~~~~~~
postmen.cpp:56:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 | for(int i=0;i<fans.size();i++){
      |             ~^~~~~~~~~~~~
postmen.cpp:57:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |     for(int j=0;j<fans[i].size();j++){
      |                 ~^~~~~~~~~~~~~~~

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