oj.uz

답안 #244486

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
244486 2020-07-04T07:14:36 Z kshitij_sodani Museum (CEOI17_museum) C++17
80 / 100
 3000 ms 72632 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=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 6 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 42 ms 43000 KB Output is correct
2 Correct 38 ms 43000 KB Output is correct
3 Correct 52 ms 45432 KB Output is correct
4 Correct 46 ms 44540 KB Output is correct
5 Correct 44 ms 43896 KB Output is correct

Subtask #3
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 43000 KB Output is correct
2 Correct 38 ms 43000 KB Output is correct
3 Correct 52 ms 45432 KB Output is correct
4 Correct 46 ms 44540 KB Output is correct
5 Correct 44 ms 43896 KB Output is correct
6 Correct 37 ms 42880 KB Output is correct
7 Correct 50 ms 45432 KB Output is correct
8 Correct 34 ms 42496 KB Output is correct
9 Correct 34 ms 42496 KB Output is correct
10 Correct 34 ms 42616 KB Output is correct

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 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 42 ms 43000 KB Output is correct
7 Correct 38 ms 43000 KB Output is correct
8 Correct 52 ms 45432 KB Output is correct
9 Correct 46 ms 44540 KB Output is correct
10 Correct 44 ms 43896 KB Output is correct
11 Correct 37 ms 42880 KB Output is correct
12 Correct 50 ms 45432 KB Output is correct
13 Correct 34 ms 42496 KB Output is correct
14 Correct 34 ms 42496 KB Output is correct
15 Correct 34 ms 42616 KB Output is correct
16 Correct 87 ms 43512 KB Output is correct
17 Correct 291 ms 44000 KB Output is correct
18 Correct 544 ms 56824 KB Output is correct
19 Correct 67 ms 42616 KB Output is correct
20 Correct 73 ms 42872 KB Output is correct
21 Execution timed out 3091 ms 72632 KB Time limit exceeded
22 Halted 0 ms 0 KB -