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Submission #47053

# Submission time Handle Problem Language Result Execution time Memory
47053 2018-04-27T03:54:59 Z RockyB Mousetrap (CEOI17_mousetrap) C++17
0 / 100
 5000 ms 55268 KB 
/// In The Name Of God
 
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
 
#include <bits/stdc++.h>
 
#define f first
#define s second
 
#define pb push_back
#define pp pop_back
#define mp make_pair
 
#define sz(x) (int)x.size()
#define sqr(x) ((x) * 1ll * (x))
#define all(x) x.begin(), x.end()
 
#define Kazakhstan ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);
 
#define nl '\n'
#define ioi exit(0);
 
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
 
const int N = (int)1e6 + 7;
const int inf = (int)1e9 + 7;
const int mod = (int)1e9 + 7;
const ll linf = (ll)1e18 + 7;
 
const int dx[] = {-1, 0, 1, 0, 1, -1, -1, 1};
const int dy[] = {0, 1, 0, -1, 1, -1, 1, -1};
 
using namespace std;
 
int n, t, m;
vector <int> g[N];
 
int go(vector < pair <int, int> > &a) {
	pair <int, int> mx = {-inf, -inf};
	for (int i = 0; i < sz(a); i++) {
		if (mx.f < a[i].f) mx = a[i];
	}
	pair <int, int> res = {-inf, -inf};
	for (int i = 0; i < sz(a); i++) {
		if (a[i] == mx) continue;
		if (res.f < a[i].f) res = a[i];
	}
	return res.s;
}
int dfs(int v = m, int p = t) {
	{
		int cnt = 0;
		for (auto to : g[v]) {
			if (to == p) continue;
			++cnt;
		}
		if (cnt <= 1) return cnt;
	}
	vector < pair <int, int> > a(sz(g[v]));
	int id = 0;
	for (auto to : g[v]) {
		if (to == p) continue;
		a[id++] = {dfs(to, v), to};
	}
	return dfs(go(a), v) + sz(a);
}
int main() {
	#ifdef IOI2018
		freopen ("in.txt", "r", stdin);
	#endif
	Kazakhstan
	cin >> n >> t >> m;
	for (int i = 1; i < n; i++) {
		int v, u;
		cin >> v >> u;
		g[v].pb(u);
		g[u].pb(v);
	}
	cout << dfs();
	ioi
}

Subtask #1
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 26 ms 23800 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Execution timed out 5037 ms 55268 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 26 ms 23800 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Incorrect 26 ms 23800 KB Output isn't correct
2 Halted 0 ms 0 KB -