oj.uz

답안 #167944

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
167944 2019-12-11T01:38:52 Z FieryPhoenix Museum (CEOI17_museum) C++11
100 / 100
 569 ms 167704 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cstdio>
#include <map>
#include <queue>
#include <set>
#include <iomanip>
#include <deque>
#include <cassert>
#include <ctime>
#include <cstring>
#include <cstdlib>
#include <chrono>
#include <ctime>
#include <random>
#include <stack>
#include <unordered_set>
#include <unordered_map>
#include <iterator>
#include <climits>
using namespace std;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef long long ll;
typedef long double ld;
#define INF 2001001001
#define MOD 1000000007

int N,K,X;
vector<pair<int,int>>adj[10001];
int subsize[10001];
vector<int>dp[10001][2]; //min cost , 0 is round trip , 1 is end

void dfs(int node, int par){
  for (auto p:adj[node])
    if (par!=p.first){
      dfs(p.first,node);
      subsize[node]+=subsize[p.first];
    }
  subsize[node]++;
  for (int i=0;i<=subsize[node];i++){
    dp[node][0].push_back(INF);
    dp[node][1].push_back(INF);
  }
  dp[node][0][1]=0;
  dp[node][1][1]=0;
  for (auto p:adj[node])
    if (par!=p.first){
      for (int i=subsize[node]-subsize[p.first];i>=1;i--){
	for (int j=1;j<=subsize[p.first] && i+j<=subsize[node];j++){
	  dp[node][0][i+j]=min(dp[node][0][i+j],dp[node][0][i]+dp[p.first][0][j]+p.second*2);
	  dp[node][1][i+j]=min(dp[node][1][i+j],dp[node][0][i]+dp[p.first][1][j]+p.second);
	  dp[node][1][i+j]=min(dp[node][1][i+j],dp[node][1][i]+dp[p.first][0][j]+p.second*2);
	}
      }
    }
}
	     
int main()
{
  //ios_base::sync_with_stdio(0);cin.tie(0);
  //freopen (".in","r",stdin);
  //freopen (".out","w",stdout);
  cin>>N>>K>>X;
  for (int i=1;i<N;i++){
    int A,B,C;
    cin>>A>>B>>C;
    adj[A].push_back({B,C});
    adj[B].push_back({A,C});
  }
  dfs(X,X);
  cout<<dp[X][1][K]<<endl;
  return 0;
}

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 1016 KB Output is correct
2 Correct 2 ms 1016 KB Output is correct
3 Correct 3 ms 1016 KB Output is correct
4 Correct 3 ms 1016 KB Output is correct
5 Correct 3 ms 1016 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 357 ms 4384 KB Output is correct
2 Correct 356 ms 4604 KB Output is correct
3 Correct 566 ms 158200 KB Output is correct
4 Correct 429 ms 55452 KB Output is correct
5 Correct 376 ms 15572 KB Output is correct

Subtask #3
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 357 ms 4384 KB Output is correct
2 Correct 356 ms 4604 KB Output is correct
3 Correct 566 ms 158200 KB Output is correct
4 Correct 429 ms 55452 KB Output is correct
5 Correct 376 ms 15572 KB Output is correct
6 Correct 357 ms 3576 KB Output is correct
7 Correct 489 ms 99420 KB Output is correct
8 Correct 472 ms 2552 KB Output is correct
9 Correct 415 ms 2604 KB Output is correct
10 Correct 363 ms 3448 KB Output is correct

Subtask #4
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 1016 KB Output is correct
2 Correct 2 ms 1016 KB Output is correct
3 Correct 3 ms 1016 KB Output is correct
4 Correct 3 ms 1016 KB Output is correct
5 Correct 3 ms 1016 KB Output is correct
6 Correct 357 ms 4384 KB Output is correct
7 Correct 356 ms 4604 KB Output is correct
8 Correct 566 ms 158200 KB Output is correct
9 Correct 429 ms 55452 KB Output is correct
10 Correct 376 ms 15572 KB Output is correct
11 Correct 357 ms 3576 KB Output is correct
12 Correct 489 ms 99420 KB Output is correct
13 Correct 472 ms 2552 KB Output is correct
14 Correct 415 ms 2604 KB Output is correct
15 Correct 363 ms 3448 KB Output is correct
16 Correct 358 ms 5176 KB Output is correct
17 Correct 357 ms 4856 KB Output is correct
18 Correct 443 ms 65144 KB Output is correct
19 Correct 440 ms 2552 KB Output is correct
20 Correct 359 ms 3560 KB Output is correct
21 Correct 479 ms 96504 KB Output is correct
22 Correct 356 ms 4728 KB Output is correct
23 Correct 440 ms 2552 KB Output is correct
24 Correct 357 ms 3576 KB Output is correct
25 Correct 569 ms 167704 KB Output is correct