Submission #525426

#	Time	Username	Problem	Language	Result	Execution time	Memory
525426		Shelter	Senior Postmen (BOI14_postmen)	C++17	0 / 100	1 ms	204 KiB

postmen

#include <bits/stdc++.h>

#define len(x) (int)(x).size()
#define range(i, x, y) for(int i=x; i<y; i++)
#define sws ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define vint vector<int>
#define vll vector<long long>
#define vstr vector<string>
#define ll long long
#define F first
#define S second
#define pb push_back
#define pf push_front
#define del(a, n) (a).erase(a.begin()+(n))
#define mp make_pair
#define all(a) (a.begin(), a.end())
const int MAX = 1e6;

using namespace std;

void hier(unordered_set<int> gra[], int n, int m, int now){
    int next = now;
    stack<int> path;
    vint sol;
    int value_edge[n+1];
    for(int i = 0; i <= n; i++){
        value_edge[i] = gra[i].size();
    }
    path.push(now);
    while(!path.empty()){
        if(value_edge[now]){
            path.push(now);
            for(auto x : gra[now]){
                next = x;
                break;
            }
            gra[now].erase(next);
            gra[next].erase(now);
            value_edge[now] --; 
            value_edge[next] --;
            now = next;
        } else{
            sol.push_back(now);
            now = path.top();
            path.pop();
        }
    }
    for(int i = sol.size()-1; i >= 0; i--){
        cout << sol[i] <<" ";
    }
}
int main(){
    sws
    int n, m;
    cin >> n >> m;
    unordered_set<int> gra[n+1];
    for(int i=0; i<m; i++){
        int u, v;
        cin >> u >> v;
        gra[u].insert(v);
        gra[v].insert(u);
    }
    while(1){
        int term = 0;
        int check = 2;
        for(int i=1; i <= n; i++){
            for(auto x : gra[i]){
                term = x;
                check = 1;
                break; 
            }
            if(check == 1)
            break;
        }
        if(term){
        hier(gra, n, m, term);
        cout << "\n";
        } else return 1;
    }
    
}

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