oj.uz

답안 #716960

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
716960 2023-03-31T13:55:06 Z Dan4Life Museum (CEOI17_museum) C++17
80 / 100
 3000 ms 834980 KB 
#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
const int mxN=(int)1e4+10;
const int LINF = (int)1e9;
int n, k, s, sub[mxN];
vector<pair<int,int>> adj[mxN];
int dp[mxN][mxN][2], dp2[mxN][mxN][2];
 
int findSize(int s, int p){
	sub[s]=1;
	for(auto [u,w] : adj[s])
		if(u!=p) sub[s]+=findSize(u,s);
	return sub[s];
}
 
void dfs(int s, int p){
	vector<pair<int,int>> v; v.clear();
	for(auto [u,w] : adj[s])
		if(u!=p) dfs(u,s), v.pb({u,w});
	dp[s][1][0]=dp[s][1][1]=0;
	if(!sz(v)) return;
	for(int i = 0; i <= sz(v); i++)
		for(int j = 0; j <= k; j++)
			dp2[i][j][0]=dp2[i][j][1]=LINF;
	dp2[0][0][0] = dp2[0][0][1] = 0; int tot = 1;
	for(int i = 1; i <= sz(v); i++){
		auto u = v[i-1].fi;
		for(int j = 0; j <= k; j++){
			for(int x = 0; x < 2; x++){
				dp2[i][j][x] = min(dp2[i][j][x],dp2[i-1][j][x]);
				for(int l = 1; l <= min(j,sub[u]); l++){//max(1,j-sizes+sub[u])
					dp2[i][j][x] = min(dp2[i][j][x], dp2[i-1][j-l][x]+dp[u][l][1]+2*v[i-1].se);
					if(!x)dp2[i][j][x] = min(dp2[i][j][x], dp2[i-1][j-l][1]+dp[u][l][0]+v[i-1].se);
				}
			}
		}
		tot+=sub[u];
	}
	for(int i = 2; i <= k; i++)
		for(int j = 0; j < 2; j++)
			dp[s][i][j] = min(dp[s][i][j],dp2[sz(v)][i-1][j]);
}

int32_t main()
{
    ios_base::sync_with_stdio(false); cin.tie(0);
    cin >> n >> k >> s;
	for(int i = 0; i < mxN; i++)
		for(int j = 0; j < mxN; j++)
			dp[i][j][0]=dp[i][j][1]=LINF;
	for(int i = 1; i < n; i++){
		int a, b, c; cin >> a >> b >> c;
		adj[a].pb({b,c}), adj[b].pb({a,c});
	}
	findSize(s,-1); dfs(s,-1); cout << dp[s][k][0];
}

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 519 ms 784852 KB Output is correct
2 Correct 334 ms 784844 KB Output is correct
3 Correct 333 ms 784816 KB Output is correct
4 Correct 336 ms 784856 KB Output is correct
5 Correct 333 ms 784820 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 382 ms 785416 KB Output is correct
2 Correct 379 ms 785392 KB Output is correct
3 Correct 524 ms 785892 KB Output is correct
4 Correct 456 ms 785612 KB Output is correct
5 Correct 440 ms 785448 KB Output is correct

Subtask #3
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 382 ms 785416 KB Output is correct
2 Correct 379 ms 785392 KB Output is correct
3 Correct 524 ms 785892 KB Output is correct
4 Correct 456 ms 785612 KB Output is correct
5 Correct 440 ms 785448 KB Output is correct
6 Correct 388 ms 785356 KB Output is correct
7 Correct 496 ms 785780 KB Output is correct
8 Correct 364 ms 834980 KB Output is correct
9 Correct 355 ms 795316 KB Output is correct
10 Correct 348 ms 785968 KB Output is correct

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 519 ms 784852 KB Output is correct
2 Correct 334 ms 784844 KB Output is correct
3 Correct 333 ms 784816 KB Output is correct
4 Correct 336 ms 784856 KB Output is correct
5 Correct 333 ms 784820 KB Output is correct
6 Correct 382 ms 785416 KB Output is correct
7 Correct 379 ms 785392 KB Output is correct
8 Correct 524 ms 785892 KB Output is correct
9 Correct 456 ms 785612 KB Output is correct
10 Correct 440 ms 785448 KB Output is correct
11 Correct 388 ms 785356 KB Output is correct
12 Correct 496 ms 785780 KB Output is correct
13 Correct 364 ms 834980 KB Output is correct
14 Correct 355 ms 795316 KB Output is correct
15 Correct 348 ms 785968 KB Output is correct
16 Correct 1175 ms 785372 KB Output is correct
17 Execution timed out 3116 ms 785464 KB Time limit exceeded
18 Halted 0 ms 0 KB -