oj.uz

Submission #853364

# Submission time Handle Problem Language Result Execution time Memory
853364 2023-09-24T08:43:41 Z manizare Chase (CEOI17_chase) C++14
70 / 100
 319 ms 260180 KB 
#include <bits/stdc++.h> 
 
#pragma GCC optimize("O3,unroll-loops")
#define pb push_back
#define F first
#define S second 
#define all(a) a.begin(),a.end()
#define pii pair <int,int>
#define Pii pair< pii , pii >
#define int long long
 
using namespace std ;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
const int maxn = 2e5 + 10 , maxq = 1e7 + 1 ,  inf = 1e18 + 10 , mod= 998244353 ,lg = 20 ;
int dis[maxn] , k , n  , w[maxn] , dp[maxn][102][3] , sm[maxn]; 
vector <int> G[maxn] ;
int ans= 0 ; 

void dfs(int v, int p =0 ){
  sm[v] = 0 ;
  for(int i =0 ; i < G[v].size() ; i++){
    int u =G[v][i] ;
    if(u == p)continue ;
    sm[v] += w[u] ;
  }
  for(int i = 1 ; i <= k ; i++){
    dp[v][i][0]= max(dp[p][i][0] , dp[p][i][1])   ;
    dp[v][i][1]= dp[p][i][2] ; 
    dp[v][i][2] = max({dp[p][i-1][0] + sm[v] , dp[p][i-1][1] + sm[v] , dp[p][i-1][2] + sm[v]});
    ans= max({ans , dp[v][i][1] , dp[v][i][0] , dp[v][i][2]}) ; 
  }
  for(int i =0 ; i < G[v].size() ; i++){
    int u =G[v][i] ;
    if(u == p)continue ;
    dfs(u, v);  
  }
}

signed main(){
  ios::sync_with_stdio(false); cin.tie(0) ;

  cin >> n >> k ;
  for(int i = 1; i <= n ; i++){
    cin >> w[i] ;
  }
  for(int i = 0 ; i <= k ; i++){
    dp[0][i][1] = -inf ;
    dp[0][i][0] = -inf ;
    dp[0][i][2] = -inf ;
  }
  dp[0][0][0] = dp[0][0][1] = dp[0][0][2] = 0 ;
  for(int i = 1; i < n; i++){
    int v, u ;
    cin >> v>> u ;
    G[v].pb(u);G[u].pb(v) ; 
  }
  if(n > 1000){
    dfs(1,  0) ;
    cout << ans ;
    return 0 ;
  }
  for(int i = 1; i <= n ; i++){
    dfs(i , 0);
  }
  cout << ans ; 
}
/*
12 2
2 3 3 8 1 5 6 7 8 3 5 4
2 1
2 7
3 4
4 7
7 6
5 6
6 8
6 9
7 10
10 11
10 12
*/

Compilation message

chase.cpp: In function 'void dfs(long long int, long long int)':
chase.cpp:22:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |   for(int i =0 ; i < G[v].size() ; i++){
      |                  ~~^~~~~~~~~~~~~
chase.cpp:33:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |   for(int i =0 ; i < G[v].size() ; i++){
      |                  ~~^~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8792 KB Output is correct
2 Correct 2 ms 8792 KB Output is correct
3 Correct 2 ms 8796 KB Output is correct
4 Correct 2 ms 8792 KB Output is correct
5 Correct 2 ms 8792 KB Output is correct
6 Correct 2 ms 8792 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8792 KB Output is correct
2 Correct 2 ms 8792 KB Output is correct
3 Correct 2 ms 8796 KB Output is correct
4 Correct 2 ms 8792 KB Output is correct
5 Correct 2 ms 8792 KB Output is correct
6 Correct 2 ms 8792 KB Output is correct
7 Correct 319 ms 13024 KB Output is correct
8 Correct 28 ms 12888 KB Output is correct
9 Correct 24 ms 13008 KB Output is correct
10 Correct 313 ms 12992 KB Output is correct
11 Correct 112 ms 12992 KB Output is correct
12 Correct 40 ms 12892 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 120 ms 257872 KB Output is correct
2 Correct 118 ms 260180 KB Output is correct
3 Correct 79 ms 254844 KB Output is correct
4 Correct 64 ms 254712 KB Output is correct
5 Correct 129 ms 254748 KB Output is correct
6 Correct 130 ms 254752 KB Output is correct
7 Correct 124 ms 254752 KB Output is correct

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8792 KB Output is correct
2 Correct 2 ms 8792 KB Output is correct
3 Correct 2 ms 8796 KB Output is correct
4 Correct 2 ms 8792 KB Output is correct
5 Correct 2 ms 8792 KB Output is correct
6 Correct 2 ms 8792 KB Output is correct
7 Correct 319 ms 13024 KB Output is correct
8 Correct 28 ms 12888 KB Output is correct
9 Correct 24 ms 13008 KB Output is correct
10 Correct 313 ms 12992 KB Output is correct
11 Correct 112 ms 12992 KB Output is correct
12 Correct 40 ms 12892 KB Output is correct
13 Correct 120 ms 257872 KB Output is correct
14 Correct 118 ms 260180 KB Output is correct
15 Correct 79 ms 254844 KB Output is correct
16 Correct 64 ms 254712 KB Output is correct
17 Correct 129 ms 254748 KB Output is correct
18 Correct 130 ms 254752 KB Output is correct
19 Correct 124 ms 254752 KB Output is correct
20 Incorrect 125 ms 254660 KB Output isn't correct
21 Halted 0 ms 0 KB -