Submission #1304703

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

const int N = 1e5 + 5;
bool in[N];
vector<vector<int> > g;

int main() {

	//freopen("readin.txt", "r", stdin);

	deque<int> q;
	int n, m;
	scanf("%d%d", &n, &m);
	g.resize(n + 1);
	for (int i = 0, a, b; i < m; i++) {
		scanf("%d%d", &a, &b);
		g[a].push_back(b);
		swap(a, b);
		g[a].push_back(b);
	}
	in[1] = true;
	q.push_front(1);
	while (1) {
		int a = q.front();
		int b = q.back();
		bool c1 = 0, c2 = 0;
		for (int i = 0; i < g[a].size(); i++) {
			int v = g[a][i];
			if (!in[v]) {
				c1 = true;
				in[v] = true;
				q.push_front(v);
				break;
			}
		}
		for (int i = 0; i < g[b].size(); i++) {
			int v = g[b][i];
			if (!in[v]) {
				c2 = true;
				in[v] = true;
				q.push_back(v);
				break;
			}
		}
		if (!c1 && !c2) break;
	}
	cout << q.size() << endl;
	while (q.size()) {
		printf("%d ", q.front());
		q.pop_front();
	}

}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:14:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
                       ^
./Main.cpp:17:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &a, &b);
                        ^

Judge Result