oj.uz

답안 #986913

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
986913 2024-05-21T14:41:02 Z amirhoseinfar1385 Museum (CEOI17_museum) C++17
100 / 100
 349 ms 150620 KB 
#include<bits/stdc++.h>
using namespace std;
const int maxn=10000+10;
struct yal{
	int u,v,w;
	int getad(int fu){
		return (u^v^fu);
	}
}alle[maxn];
vector<int>adj[maxn];
int sz[maxn],n,x,k,inf=1e9;
vector<int>dp[maxn],pd[maxn];

void vorod(){
	cin>>n>>k>>x;
	for(int i=0;i<n-1;i++){
		cin>>alle[i].u>>alle[i].v>>alle[i].w;
		adj[alle[i].u].push_back(i);
		adj[alle[i].v].push_back(i);
	}
}

void add(int u,int w){
	for(int i=1;i<(int)dp[u].size();i++){
		dp[u][i]+=w;
		pd[u][i]+=2*w;
	}
}

void merge(int u,int v){
	int szu=dp[u].size(),szv=dp[v].size();
	vector<int>fake(szu+szv-1,inf),fakea(szu+szv-1,inf);
	for(int i=0;i<szu;i++){
		for(int j=0;j<szv;j++){
			fake[i+j]=min(fake[i+j],dp[u][i]+pd[v][j]);
			fake[i+j]=min(fake[i+j],pd[u][i]+dp[v][j]);
			fakea[i+j]=min(fakea[i+j],pd[u][i]+pd[v][j]);
		}
	}
	dp[u].swap(fake);
	pd[u].swap(fakea);
}

void dfs(int u,int par=-1){
	dp[u].resize(2);
	pd[u].resize(2);
	for(auto x:adj[u]){
		int v=alle[x].getad(u);
		if(v==par){
			continue;
		}
		dfs(v,u);
		add(v,alle[x].w);
		merge(u,v);
	}
//	cout<<"hey: "<<u<<" "<<par<<endl;
//	for(auto x:dp[u]){
//		cout<<x<<" ";
//	}
//	cout<<"\n";
//	for(auto x:pd[u]){
//		cout<<x<<" ";
//	}
//	cout<<"\n";
}

void solve(){
	dfs(x);
}

void khor(){
	cout<<dp[x][k]<<"\n";
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
//	freopen("inp.txt","r",stdin);
	vorod();
	solve();
	khor();
}

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 1112 KB Output is correct
2 Correct 1 ms 1116 KB Output is correct
3 Correct 1 ms 1116 KB Output is correct
4 Correct 1 ms 1116 KB Output is correct
5 Correct 1 ms 1116 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 95 ms 3920 KB Output is correct
2 Correct 96 ms 4336 KB Output is correct
3 Correct 224 ms 150620 KB Output is correct
4 Correct 139 ms 48688 KB Output is correct
5 Correct 105 ms 12952 KB Output is correct

Subtask #3
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 95 ms 3920 KB Output is correct
2 Correct 96 ms 4336 KB Output is correct
3 Correct 224 ms 150620 KB Output is correct
4 Correct 139 ms 48688 KB Output is correct
5 Correct 105 ms 12952 KB Output is correct
6 Correct 101 ms 3436 KB Output is correct
7 Correct 177 ms 88760 KB Output is correct
8 Correct 349 ms 2760 KB Output is correct
9 Correct 241 ms 2852 KB Output is correct
10 Correct 116 ms 3372 KB Output is correct

Subtask #4
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 1112 KB Output is correct
2 Correct 1 ms 1116 KB Output is correct
3 Correct 1 ms 1116 KB Output is correct
4 Correct 1 ms 1116 KB Output is correct
5 Correct 1 ms 1116 KB Output is correct
6 Correct 95 ms 3920 KB Output is correct
7 Correct 96 ms 4336 KB Output is correct
8 Correct 224 ms 150620 KB Output is correct
9 Correct 139 ms 48688 KB Output is correct
10 Correct 105 ms 12952 KB Output is correct
11 Correct 101 ms 3436 KB Output is correct
12 Correct 177 ms 88760 KB Output is correct
13 Correct 349 ms 2760 KB Output is correct
14 Correct 241 ms 2852 KB Output is correct
15 Correct 116 ms 3372 KB Output is correct
16 Correct 97 ms 4572 KB Output is correct
17 Correct 96 ms 4436 KB Output is correct
18 Correct 146 ms 56916 KB Output is correct
19 Correct 259 ms 2872 KB Output is correct
20 Correct 111 ms 3828 KB Output is correct
21 Correct 168 ms 84048 KB Output is correct
22 Correct 105 ms 4236 KB Output is correct
23 Correct 265 ms 2888 KB Output is correct
24 Correct 102 ms 3408 KB Output is correct
25 Correct 230 ms 143580 KB Output is correct