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답안 #245844

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
245844 2020-07-07T15:06:25 Z kshitij_sodani Chase (CEOI17_chase) C++17
100 / 100
 1125 ms 334328 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'
llo n,m;
llo it[100001];
llo co[100001];
vector<llo> adj[100001];
llo dp[100001][101][2];
llo dp2[100001][101][2];
llo ans=0;
vector<pair<llo,int>> ac[101][2][2];
void dfs(llo no,llo par2=-1){
	for(llo i=1;i<=m;i++){
		dp[no][i][0]=0;
		dp2[no][i][0]=0;
		dp[no][i][1]=co[no];
		dp2[no][i][1]=co[no];
	}
	
	for(auto j:adj[no]){
		if(j==par2){
			continue;
		}
		dfs(j,no);
	}
	for(int i=0;i<=m;i++){
		ac[i][0][0].clear();
		ac[i][1][0].clear();
		ac[i][1][1].clear();
		ac[i][0][1].clear();
	}
	for(auto j:adj[no]){
		if(j==par2){
			continue;
		}
		for(llo i=0;i<=m;i++){
			llo x=0;
			llo y=0;
			if(i>0){
				x=max(x,dp[j][i-1][0]+co[no]);
				if(i>1){
					x=max(x,dp[j][i-1][1]+co[no]-it[no]);
				}
			}

			dp[no][i][1]=max(dp[no][i][1],x);

			y=max(y,dp[j][i][0]);
			if(i>0){
				y=max(y,dp[j][i][1]-it[no]);
			}
			dp[no][i][0]=max(dp[no][i][0],y);
	//		ac[i][0][1].pb({x,j});
			ac[i][0][0].pb({y,j});
			if(ac[i][0][0].size()==3){
				sort(ac[i][0][0].begin(),ac[i][0][0].end());
				reverse(ac[i][0][0].begin(),ac[i][0][0].end());
				ac[i][0][0].pop_back();
			}
			
		//	ac[i][0].pb({max(x,y),j});
			x=0;
			y=0;

			if(i>0){
				x=max(x,dp2[j][i-1][0]+co[no]-it[j]);
				if(i>1){
					x=max(x,dp2[j][i-1][1]+co[no]-it[j]);
				}
				y=max(y,dp2[j][i][1]);
			}
			y=max(y,dp2[j][i][0]);
			dp2[no][i][0]=max(dp2[no][i][0],y);
			dp2[no][i][1]=max(dp2[no][i][1],x);
			ac[i][1][0].pb({y,j});
			if(ac[i][1][0].size()==3){
				sort(ac[i][1][0].begin(),ac[i][1][0].end());
				reverse(ac[i][1][0].begin(),ac[i][1][0].end());
				ac[i][1][0].pop_back();
			}
			ac[i][1][1].pb({x,j});
			if(ac[i][1][1].size()==3){
				sort(ac[i][1][1].begin(),ac[i][1][1].end());
				reverse(ac[i][1][1].begin(),ac[i][1][1].end());
				ac[i][1][1].pop_back();
			}
		//	ac[i][1].pb({max(x,y),j});
		}
	}
	ans=max(ans,dp[no][m][0]);
	ans=max(ans,dp[no][m][1]);
	ans=max(ans,dp2[no][m][0]);
	ans=max(ans,dp2[no][m][1]);

	for(llo i=0;i<=m;i++){
		for(int k=0;k<2;k++){
			for(int l=0;l<2;l++){
				sort(ac[i][k][l].begin(),ac[i][k][l].end());
				reverse(ac[i][k][l].begin(),ac[i][k][l].end());
			}
		}
		for(int k=0;k<2;k++){
			for(int l=0;l<2;l++){
				if(l==1 and k==1){
					continue;
				}
				if(l==0 and k==1){
					continue;
				}
			
				if(ac[i][0][k].size()>0 and ac[m-i][1][l].size()>0){
					if(ac[i][0][k][0].b==ac[m-i][1][l][0].b){
						if(ac[i][0][k].size()>1){
							ans=max(ans,ac[i][0][k][1].a+ac[m-i][1][l][0].a);
						}
						if(ac[m-i][1][l].size()>1){
							ans=max(ans,ac[i][0][k][0].a+ac[m-i][1][l][1].a);
						}
					}
					else{
						ans=max(ans,ac[i][0][k][0].a+ac[m-i][1][l][0].a);
					}
				}
			}
		}
	}




}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n>>m;
	for(llo i=0;i<n;i++){
		cin>>it[i];
	}
	for(llo i=0;i<n-1;i++){
		llo aa,bb;
		cin>>aa>>bb;
		aa--;
		bb--;
		adj[aa].pb(bb);
		adj[bb].pb(aa);
		co[aa]+=it[bb];
		co[bb]+=it[aa];
	}
	/*if(n<=1000){
		for(int i=0;i<n;i++){
			dfs(i);
		}
	}*/
	dfs(0);
	cout<<ans<<endl;
//	cout<<max(dp[0][m][1],dp[0][m][0])<<endl;


	return 0;
}

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 2688 KB Output is correct
2 Correct 6 ms 2688 KB Output is correct
3 Correct 6 ms 2816 KB Output is correct
4 Correct 6 ms 2688 KB Output is correct
5 Correct 6 ms 2688 KB Output is correct
6 Correct 6 ms 2816 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 2688 KB Output is correct
2 Correct 6 ms 2688 KB Output is correct
3 Correct 6 ms 2816 KB Output is correct
4 Correct 6 ms 2688 KB Output is correct
5 Correct 6 ms 2688 KB Output is correct
6 Correct 6 ms 2816 KB Output is correct
7 Correct 16 ms 6016 KB Output is correct
8 Correct 9 ms 6016 KB Output is correct
9 Correct 8 ms 5888 KB Output is correct
10 Correct 16 ms 6036 KB Output is correct
11 Correct 11 ms 5888 KB Output is correct
12 Correct 9 ms 5888 KB Output is correct

Subtask #3
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1047 ms 332192 KB Output is correct
2 Correct 1041 ms 332124 KB Output is correct
3 Correct 1044 ms 324516 KB Output is correct
4 Correct 276 ms 324216 KB Output is correct
5 Correct 1092 ms 324344 KB Output is correct
6 Correct 1094 ms 324600 KB Output is correct
7 Correct 1072 ms 324472 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 2688 KB Output is correct
2 Correct 6 ms 2688 KB Output is correct
3 Correct 6 ms 2816 KB Output is correct
4 Correct 6 ms 2688 KB Output is correct
5 Correct 6 ms 2688 KB Output is correct
6 Correct 6 ms 2816 KB Output is correct
7 Correct 16 ms 6016 KB Output is correct
8 Correct 9 ms 6016 KB Output is correct
9 Correct 8 ms 5888 KB Output is correct
10 Correct 16 ms 6036 KB Output is correct
11 Correct 11 ms 5888 KB Output is correct
12 Correct 9 ms 5888 KB Output is correct
13 Correct 1047 ms 332192 KB Output is correct
14 Correct 1041 ms 332124 KB Output is correct
15 Correct 1044 ms 324516 KB Output is correct
16 Correct 276 ms 324216 KB Output is correct
17 Correct 1092 ms 324344 KB Output is correct
18 Correct 1094 ms 324600 KB Output is correct
19 Correct 1072 ms 324472 KB Output is correct
20 Correct 1088 ms 324472 KB Output is correct
21 Correct 306 ms 234904 KB Output is correct
22 Correct 1082 ms 326316 KB Output is correct
23 Correct 280 ms 326364 KB Output is correct
24 Correct 1125 ms 326512 KB Output is correct
25 Correct 1054 ms 326220 KB Output is correct
26 Correct 1116 ms 334328 KB Output is correct
27 Correct 1056 ms 334328 KB Output is correct