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답안 #292014

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
292014 2020-09-06T07:56:48 Z shivensinha4 Museum (CEOI17_museum) C++17
20 / 100
 3000 ms 48424 KB 
#include <bits/stdc++.h> 
using namespace std; 
#define for_(i, s, e) for (int i = s; i < (int) e; i++)
#define for__(i, s, e) for (ll i = s; i < e; i++)
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> ii;
#define endl '\n'

const int MXN = 1e4+1;
int n, k;
vector<vector<pair<int, ll>>> adj;
ll dp[MXN+1][MXN+1][2];
int sub[MXN+1];
const ll INF = 1e15;

void dfs(int p, int parent) {
	int sz = 1;
	for (auto i: adj[p]) if (i.first != parent) {
		dfs(i.first, p);
		sz += sub[i.first];
	}
	
	for_(i, 0, sz+1) dp[p][i][0] = dp[p][i][1] = INF;
	dp[p][1][0] = dp[p][1][1] = 0;
	
	for (auto i: adj[p]) if (i.first != parent) {
		for (int ct = sz; ct >= 2; ct--) for (int t = min(ct-1, sub[i.first]); t >= 1; t--) {
			dp[p][ct][1] = min(dp[p][ct][1], dp[p][ct-t][1] + dp[i.first][t][1] + 2*i.second);
			dp[p][ct][0] = min(dp[p][ct][0], dp[p][ct-t][0] + dp[i.first][t][1] + 2*i.second);
			dp[p][ct][0] = min(dp[p][ct][0], dp[p][ct-t][1] + dp[i.first][t][0] + i.second);
		}
	}
	sub[p] = sz;
}

int main() {
	#ifndef ONLINE_JUDGE
	//freopen("test.in", "r", stdin);
	#endif
	
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	
	int x; cin >> n >> k >> x;
	adj.resize(n);
	for_(i, 0, n-1) {
		int a, b, w; cin >> a >> b >> w;
		a -= 1; b -= 1; 
		adj[a].push_back({b, w});
		adj[b].push_back({a, w});
	}
	
	x -= 1;
	dfs(x, x);
	
	cout << dp[x][k][0] << endl;

	return 0;
}

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 512 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct

Subtask #2
0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1459 ms 47828 KB Output is correct
2 Correct 2063 ms 48424 KB Output is correct
3 Execution timed out 3078 ms 44852 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #3
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1459 ms 47828 KB Output is correct
2 Correct 2063 ms 48424 KB Output is correct
3 Execution timed out 3078 ms 44852 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 512 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1459 ms 47828 KB Output is correct
7 Correct 2063 ms 48424 KB Output is correct
8 Execution timed out 3078 ms 44852 KB Time limit exceeded
9 Halted 0 ms 0 KB -