Submission #733347

#	Time	Username	Problem	Language	Result	Execution time	Memory
733347		Trunkty	Senior Postmen (BOI14_postmen)	C++14	55 / 100	650 ms	157476 KiB

postmen

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll

int n,m;
vector<vector<int>> roads[500005];
int poi[500005];
bool mark[500005];
bool vis[500005];
vector<int> curr;
vector<vector<int>> ans;

void euler(int x){
    if(vis[x]){
        curr = {x};
        return;
    }
    vis[x] = true;
    while(roads[x].size()!=poi[x]){
        int p = roads[x][poi[x]][0], q = roads[x][poi[x]][1];
        poi[x]++;
        if(mark[q]){
            continue;
        }
        mark[q] = true;
        euler(p);
        if(curr.size()>0 and curr[0]!=x){
            curr.push_back(x);
            vis[x] = false;
            return;
        }
        else if(curr[0]==x){
            ans.push_back(curr);
            curr.clear();
        }
    }
}

signed main(){
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	cin >> n >> m;
    for(int i=1;i<=m;i++){
        int a,b;
        cin >> a >> b;
        roads[a].push_back({b,i});
        roads[b].push_back({a,i});
    }
    for(int i=1;i<=n;i++){
        if(roads[i].size()>0){
            euler(i);
        }
    }
    for(vector<int> i:ans){
        for(int j:i){
            cout << j << " ";
        }
        cout << "\n";
    }
	return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'void euler(ll)':
postmen.cpp:20:26: warning: comparison of integer expressions of different signedness: 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   20 |     while(roads[x].size()!=poi[x]){
      |           ~~~~~~~~~~~~~~~^~~~~~~~

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