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  1. #include <stdio.h>
  2.  
  3. int c[25][25];
  4. int dp[(1<<20)+5];
  5.  
  6. int main(){
  7.     int N, K;
  8.     scanf("%d%d", &N, &K);
  9.     for(int i=0; i<N; i++) for(int j=0; j<N; j++) scanf("%d", &c[i][j]);
  10.     for(int i=1; i<(1<<N); i++) dp[i] = 2e9;
  11.     int res = 2e9;
  12.     for(int mask=0; mask<(1<<N); mask++){
  13.         int bcnt = __builtin_popcount(mask);
  14.         if(N-bcnt <= K && dp[mask] < res) res = dp[mask];
  15.         for(int i=0; i<N; i++){
  16.             if(mask&(1<<i)) continue;
  17.             int newbit = mask|(1<<i);
  18.             int cost = 2e5;
  19.             for(int j=0; j<N; j++){
  20.                 if((mask&(1<<j)) || j == i) continue;
  21.                 if(c[i][j] < cost) cost = c[i][j];
  22.             }
  23.             if(dp[mask]+cost < dp[newbit]) dp[newbit] = dp[mask]+cost;
  24.         }
  25.     }
  26.     printf("%d", res);
  27.     return 0;
  28. }
Time limit exceeded #stdin #stdout 5s 7556KB
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https://ideone.com/rrZTzT
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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