Submission #846449

#	Time	Username	Problem	Language	Result	Execution time	Memory
846449		Cookie	Senior Postmen (BOI14_postmen)	C++14	100 / 100	357 ms	81908 KiB

postmen

#include<bits/stdc++.h>
#define ll long long
#define vt vector
#define pb push_back
#define pii pair<int, int>
#define sz(v) (int)v.size()
#define fi first
#define se second
using namespace std;
const ll base = 107, mod = 1e9 + 7;
const int mxn = 5e5 + 5;
int n, m;
vt<pii>adj[mxn + 1];
int trace[mxn + 1], at[mxn + 1];
bool vis[mxn + 1], used[mxn + 1];
void dfs(int s){
    if(vis[s]){
        int x = s;
        while(vis[x]){
            cout << x << ' '; vis[x] = 0; x = trace[x];
        }
        cout << "\n";
    }
    for(int &i = at[s]; i < sz(adj[s]); i++){
        auto [v, id] = adj[s][i];
        if(!used[id]){
            used[id] = 1; vis[s] = 1; trace[s] = v;
            dfs(v);
        }
    }
}
int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n >> m;
    for(int i = 0; i < m; i++){
        int u, v; cin >> u >> v;
        adj[u].pb({v, i}); adj[v].pb({u, i});
    }
    dfs(1);
}

Compilation message (stderr)

postmen.cpp: In function 'void dfs(int)':
postmen.cpp:25:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   25 |         auto [v, id] = adj[s][i];
      |              ^

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