Submission #116046

#	Time	Username	Problem	Language	Result	Execution time	Memory
116046		MAMBA	Senior Postmen (BOI14_postmen)	C++17	0 / 100	17 ms	12160 KiB

postmen

#pragma GCC optimize("Ofast")
#include <bits/stdc++.h> 

using namespace std;

#define rep(i , j , k) for (int i = j; i < (int)k; i++)
#define pb push_back
typedef vector<int> vi;

constexpr int N = 5e5 + 10;

int n, m, a[N], b[N];
vector<int> adj[N];
int ptr[N];
bitset<N> mark, mark2;

int st[N], R;
void dfs(int v) {
	for (int &id = ptr[v]; id < (int)adj[v].size(); id++) {
		int e = adj[v][id];
		if (!mark[e]) {
			mark[e] = true;
			dfs(a[e] ^ b[e] ^ v);
		}
	}
	if (mark2[v]) {
		while (mark2[v]) {
			printf("%d" , st[R]);
			printf("%d" , (st[R] == v ? '\n' : ' '));
			mark2[st[R]] = false;
			R--;
		}
	} 
	mark2[v] = true;
	st[++R] = v;

}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

	cin >> n >> m;
	rep(i , 0 , m) {
		scanf("%d%d" , a + i , b + i);
		adj[a[i]].pb(i);
		adj[b[i]].pb(i);
	}

	dfs(1);

	return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:46:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d" , a + i , b + i);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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