Submission #29522562

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Source Code Expand

#include<cstdio>
#include<vector>
#include<algorithm>
using namespace std;
vector<int> e[200002];
pair<int, int> ans[200002];
inline void DFS(const int pos, const int f)
{
	static int cnt = 0;
	if (e[pos].size() == 1 && f != 0)
	{
		ans[pos].first = ans[pos].second = (++cnt);
	}
	else
	{
		for (const int i : e[pos])
		{
			if (i != f)
			{
				DFS(i, pos);
				if (ans[pos].first == 0)
				{
					ans[pos].first = ans[i].first;
				}
				ans[pos].second = ans[i].second;
			}
		}
	}
	return;
}
int main()
{
	int n;
	scanf("%d", &n);
	for (int i = 1; i < n; ++i)
	{
		int u, v;
		scanf("%d%d", &u, &v);
		e[u].emplace_back(v);
		e[v].emplace_back(u);
	}
	DFS(1, 0);
	for (int i = 1; i <= n; printf("%d %d\n", ans[i].first, ans[i].second), ++i);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:34:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   34 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
./Main.cpp:38:8: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   38 |   scanf("%d%d", &u, &v);
      |   ~~~~~^~~~~~~~~~~~~~~~

Judge Result