Submission #704187

#	Time	Username	Problem	Language	Result	Execution time	Memory
704187		boyliguanhan	Senior Postmen (BOI14_postmen)	C++17	55 / 100	526 ms	107396 KiB

postmen

#include<bits/stdc++.h>
#pragma GCC optimize(2)
using namespace std;
set<int> adj[500100];
int deg[500100];
stack<int> sol;
void reverse(){
    stack<int> temp;
    while(sol.size())
        temp.push(sol.top()), sol.pop();
    sol = temp;
}
void print(){
    stack<int> now;
    bitset<500100> appeared;
    while(sol.size()){
        if(appeared[sol.top()]){
            printf("%d", sol.top());
            while(now.top()!=sol.top())
                printf(" %d", now.top()), appeared[now.top()] = 0, now.pop();
            printf("\n");
        } else {
            appeared[sol.top()] = 1;
            now.push(sol.top());
        }
        sol.pop();
    }
}
void dfs(int n){
    while(adj[n].size()){
        int i = *adj[n].begin();
        adj[n].erase(i);
        adj[i].erase(n);
        dfs(i);
    }
    sol.push(n);
}
int main(){
    int n, m;
    scanf("%d%d", &n, &m);
    for(int i = 0; i < m; i++) {
        int a, b;
        scanf("%d%d", &a, &b);
        adj[a].insert(b);
        adj[b].insert(a);
        deg[a]++;
        deg[b]++;
    }
    dfs(1);
    reverse();
    print();
    return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:40:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
postmen.cpp:43:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |         scanf("%d%d", &a, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~

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