Submission #5646954


Source Code Expand

#include <cstdio>
#include <vector>
std::vector<int> adj[100005];
int dfs(int u, int fa = -1)
{
	int ans = 0, zero = 0;
	for (int v : adj[u])
	{
		if (v == fa)
			continue;
		int res = dfs(v, u);
		ans += res;
		zero += !res;
	}
	return ans + (zero ? zero - 1 : 0);
}
int main()
{
	// freopen("F.in", "r", stdin);
	int n;
	scanf("%d", &n);
	for (int i = 1; i < n; i++)
	{
		int u, v;
		scanf("%d%d", &u, &v);
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	int rt = -1;
	for (int i = 0; i < n && rt == -1; i++)
	{
		if (adj[i].size() >= 3)
			rt = i;
	}
	if (-1 == rt)
		puts("1");
	else
		printf("%d\n", dfs(rt));
	return 0;
}

Submission Info

Submission Time
Task E - Antennas on Tree
User diamond_duke
Language C++14 (GCC 5.4.1)
Score 900
Code Size 670 Byte
Status AC
Exec Time 52 ms
Memory 9088 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:21:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
./Main.cpp:25:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &u, &v);
                        ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 900 / 900
Status
AC × 3
AC × 26
Set Name Test Cases
Sample 0_00.txt, 0_01.txt, 0_02.txt
All 0_00.txt, 0_01.txt, 0_02.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt, 1_12.txt, 1_13.txt, 1_14.txt, 1_15.txt, 1_16.txt, 1_17.txt, 1_18.txt, 1_19.txt, 1_20.txt, 1_21.txt, 1_22.txt
Case Name Status Exec Time Memory
0_00.txt AC 2 ms 2560 KB
0_01.txt AC 2 ms 2560 KB
0_02.txt AC 2 ms 2560 KB
1_00.txt AC 2 ms 2560 KB
1_01.txt AC 2 ms 2560 KB
1_02.txt AC 2 ms 2560 KB
1_03.txt AC 2 ms 2560 KB
1_04.txt AC 2 ms 2560 KB
1_05.txt AC 2 ms 2560 KB
1_06.txt AC 37 ms 5760 KB
1_07.txt AC 29 ms 6136 KB
1_08.txt AC 37 ms 5760 KB
1_09.txt AC 30 ms 6136 KB
1_10.txt AC 47 ms 9088 KB
1_11.txt AC 47 ms 7296 KB
1_12.txt AC 47 ms 5888 KB
1_13.txt AC 52 ms 5760 KB
1_14.txt AC 39 ms 5760 KB
1_15.txt AC 38 ms 5760 KB
1_16.txt AC 39 ms 5760 KB
1_17.txt AC 40 ms 5888 KB
1_18.txt AC 35 ms 6016 KB
1_19.txt AC 34 ms 6272 KB
1_20.txt AC 35 ms 6144 KB
1_21.txt AC 33 ms 6144 KB
1_22.txt AC 31 ms 6136 KB