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  1. /******
  2. author :- Mahmoud Tarek.
  3. *******/
  4.  
  5. #include<bits/stdc++.h>
  6.  
  7. using namespace std ;
  8.  
  9. #define rg register
  10. #define dbg(v) cerr << #v << " " << v ;
  11. typedef long long ll ;
  12.  
  13. int n, m, x, y ;
  14. const int N = 1e3 + 5 ;
  15. char a[N][N] ;
  16. int w[N], b[N] ;
  17. int dp[N][N][4] ;
  18.  
  19. int solve(int i, int color, int k){
  20.     if(k < x) return  2 * N * N ;
  21.     if(i == m) return 0 ;
  22.     int ret = dp[i][k][color] ;
  23.     if(~ret) return ret ;
  24.     ret = b[i] + solve(i + 1, 0, (color != 0 ? y-1: k - 1)) ;
  25.     ret = min(ret, w[i] + solve(i + 1, 1, (color != 1 ? y-1: k - 1))) ;
  26.     return ret ;
  27. }
  28.  
  29. int main() {
  30. //  freopen("in.txt", "r", stdin) ;
  31.  
  32.     cin >> n >> m >> x >> y ;
  33.     for(int i = 0 ; i < n ; i++){
  34.         for(int j = 0 ; j < m ; j++){
  35.             cin >> a[i][j] ;
  36.         }
  37.     }
  38.  
  39.     for(int j = 0 ; j < m ; j++){
  40.         for(int i = 0 ; i < n ; i++) b[j] += a[i][j] == '#' ;
  41.         w[j] = n - b[j] ;
  42.       //  cout << w[j] << " " << b[j] << "\n" ;
  43.     }
  44.  
  45.     memset(dp, -1, sizeof dp) ;
  46.     cout << solve(0, 2, y-1) ;
  47. }
  48.  
  49. /*
  50.   Empty set of troubles.
  51. */
Success #stdin #stdout 0.01s 19404KB
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22
https://ideone.com/JuY5Z2
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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