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Submission #460716

# Submission time Handle Problem Language Result Execution time Memory
460716 2021-08-09T08:30:53 Z benson0402 Papričice (COCI20_papricice) C++14
50 / 110
 123 ms 588 KB 
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("Ofast")

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

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
#define F first
#define S second
#define ALL(x) x.begin(), x.end()
#define MEM(x) memset(x, 0, sizeof(x))
#define MEMS(x) memset(x, -1, sizeof(x))

#define eb emplace_back
#define ep emplace
#define mkp make_pair

const int INF = 0x3f3f3f3f;
const ll LINF = 0x3f3f3f3f3f3f3f3f;
/*------------------------------------------------------------------*/

const int N = 2000 + 5;

vector<int> G[N];
vector<pii> edge;

int sz[N];

void dfs(int u, int p) {
	sz[u] = 1;
	for(auto& v : G[u]) if(v != p) {
		dfs(v, u);
		sz[u] += sz[v];
	}
}

inline void solve() {
	int n; cin >> n;
	for(int i = 0; i < n - 1; ++i) {
		int u, v; cin >> u >> v;
		G[u].eb(v);
		G[v].eb(u);
		edge.eb(u, v);
	}
	int ans = N;
	for(auto& x : edge) {
		MEM(sz);
		dfs(x.F, x.S);
		for(int i = 0; i < n; ++i) {
			int mx = max({n - sz[x.F], sz[x.F] - sz[i], sz[i]});
			int mn = min({n - sz[x.F], sz[x.F] - sz[i], sz[i]});
			ans = min(ans, mx - mn);
		}
		MEM(sz);
		dfs(x.S, x.F);
		for(int i = 0; i < n; ++i) {
			int mx = max({n - sz[x.S], sz[x.S] - sz[i], sz[i]});
			int mn = min({n - sz[x.S], sz[x.S] - sz[i], sz[i]});
			ans = min(ans, mx - mn);
		}
	}
	cout << ans << '\n';
}

int main() {
	cin.tie(0), ios::sync_with_stdio(0);
	solve();
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 2 ms 360 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 2 ms 332 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 2 ms 360 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 2 ms 332 KB Output is correct
6 Correct 107 ms 460 KB Output is correct
7 Correct 121 ms 460 KB Output is correct
8 Correct 72 ms 460 KB Output is correct
9 Correct 92 ms 460 KB Output is correct
10 Correct 123 ms 460 KB Output is correct

Subtask #3
0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 2 ms 360 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 2 ms 332 KB Output is correct
6 Correct 107 ms 460 KB Output is correct
7 Correct 121 ms 460 KB Output is correct
8 Correct 72 ms 460 KB Output is correct
9 Correct 92 ms 460 KB Output is correct
10 Correct 123 ms 460 KB Output is correct
11 Runtime error 1 ms 588 KB Execution killed with signal 11
12 Halted 0 ms 0 KB -