oj.uz

답안 #244489

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
244489 2020-07-04T07:18:14 Z kshitij_sodani Museum (CEOI17_museum) C++17
80 / 100
 289 ms 117752 KB 
#include <bits/stdc++.h>
using namespace std;
typedef int64_t llo;
#define mp make_pair
#define pb push_back
#define a first 
#define b second
//#define endl '\n'

int n,k,x;
vector<pair<int,int>> adj[10001];
int dp[10001][10001][2];
//0-return
//1-don't return
int ss[1001];
int min2(int aa,int bb){
	if(aa==0){
		return bb;
	}
	return min(aa,bb);
}
void dfs(int no,int par=-1){

	ss[no]=1;

	for(auto j:adj[no]){
		if(j.a==par){
			continue;
		}
		dfs(j.a,no);
		ss[no]+=ss[j.a];
	}
	int cur=0;
	dp[no][1][1]=0;
	dp[no][1][0]=0;
	for(auto j:adj[no]){
		if(j.a==par){
			continue;
		}
		cur+=ss[j.a];
		for(int i=min(cur+1,k);i>=2;i--){
			for(int kk=max(1,i-(cur-ss[j.a]+1));kk<=min(i-1,ss[j.a]);kk++){
				if(i-kk>cur-ss[j.a]+1){
					continue;
				}
				else{
					/*if(dp[no][i-kk][0]==-1){
						cout<<no<<","<<i-kk<<','<<0<<endl;
					}*/
				}
				//if(dp[no][i-kk][0]>-1){
					dp[no][i][0]=min2(dp[no][i][0],dp[no][i-kk][0]+dp[j.a][kk][0]+2*j.b);
					dp[no][i][1]=min2(dp[no][i][1],dp[no][i-kk][0]+dp[j.a][kk][1]+j.b);
				//}
				//if(dp[no][i-kk][1]>-1){
					dp[no][i][1]=min2(dp[no][i][1],dp[no][i-kk][1]+dp[j.a][kk][0]+2*j.b);
				//}
			}
		}
	}
	/*cout<<no<<endl;
	for(int j=1;j<=ss[no];j++){
		cout<<dp[no][j][0]<<",";
	}
	cout<<endl;
	for(int j=1;j<=ss[no];j++){
		cout<<dp[no][j][1]<<",";
	}
	cout<<endl;
*/


}



int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n>>k>>x;
	x--;
	for(int i=0;i<n-1;i++){
		int aa,bb,cc;
		cin>>aa>>bb>>cc;
		aa--;
		bb--;
		adj[aa].pb({bb,cc});
		adj[bb].pb({aa,cc});
	}
	/*for(int i=0;i<n;i++){
		for(int j=1;j<=k;j++){
			dp[i][j][0]=-1;
			dp[i][j][1]=-1;
		}
	}*/
	dfs(x);
	cout<<min(dp[x][k][1],dp[x][k][0])<<endl;
	



	return 0;
}

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 640 KB Output is correct
2 Correct 5 ms 640 KB Output is correct
3 Correct 5 ms 640 KB Output is correct
4 Correct 5 ms 640 KB Output is correct
5 Correct 5 ms 640 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 41 ms 43000 KB Output is correct
2 Correct 36 ms 43008 KB Output is correct
3 Correct 43 ms 45536 KB Output is correct
4 Correct 37 ms 44360 KB Output is correct
5 Correct 37 ms 43904 KB Output is correct

Subtask #3
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 41 ms 43000 KB Output is correct
2 Correct 36 ms 43008 KB Output is correct
3 Correct 43 ms 45536 KB Output is correct
4 Correct 37 ms 44360 KB Output is correct
5 Correct 37 ms 43904 KB Output is correct
6 Correct 37 ms 42872 KB Output is correct
7 Correct 38 ms 45440 KB Output is correct
8 Correct 36 ms 42488 KB Output is correct
9 Correct 34 ms 42496 KB Output is correct
10 Correct 36 ms 42624 KB Output is correct

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 640 KB Output is correct
2 Correct 5 ms 640 KB Output is correct
3 Correct 5 ms 640 KB Output is correct
4 Correct 5 ms 640 KB Output is correct
5 Correct 5 ms 640 KB Output is correct
6 Correct 41 ms 43000 KB Output is correct
7 Correct 36 ms 43008 KB Output is correct
8 Correct 43 ms 45536 KB Output is correct
9 Correct 37 ms 44360 KB Output is correct
10 Correct 37 ms 43904 KB Output is correct
11 Correct 37 ms 42872 KB Output is correct
12 Correct 38 ms 45440 KB Output is correct
13 Correct 36 ms 42488 KB Output is correct
14 Correct 34 ms 42496 KB Output is correct
15 Correct 36 ms 42624 KB Output is correct
16 Correct 76 ms 43512 KB Output is correct
17 Correct 176 ms 44028 KB Output is correct
18 Correct 81 ms 56700 KB Output is correct
19 Correct 84 ms 42492 KB Output is correct
20 Correct 67 ms 42872 KB Output is correct
21 Incorrect 289 ms 117752 KB Output isn't correct
22 Halted 0 ms 0 KB -