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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define sd(x) scanf("%d", &x);
  4. const int N = 20;
  5. int dp[1 << 20];
  6. int CS[1 << N], w2[N][N], w[N][N];
  7.  
  8. const int INF = 1 << 30;
  9. int main(){
  10.     int t; sd(t);
  11.     while(t--){
  12.         memset(CS, 0, sizeof CS);
  13.         memset(dp, 0, sizeof dp);
  14.         int n = 20, k = 3;
  15.         sd(n); sd(k);
  16.         for(int i = 0; i < n; i++)
  17.         for(int j = 0; j < n; j++){
  18.             w2[i][j] = 
  19.             (rand() % INF) >> 10;
  20.             sd(w2[i][j]);
  21.         }
  22.         for(int i = 0; i < n; i++)
  23.             for(int j = 0; j < n; j++) w[i][j] = w2[n - 1 - i][n - 1 - j];
  24.         int extra = n - k;
  25.  
  26.         for(int i = 0; i < n; i++)
  27.             for(int j = 0; j < i; j++){
  28.                 int rem = ((1 << n) - 1) ^ (1 << i) ^ (1 << j);
  29.                 int c = w[i][j];
  30.                 for(int mask = rem; ; mask = (mask - 1) & rem){
  31.                     CS[mask ^ (1 << i) ^ (1 << j)] += c;
  32.                     if(!mask) break;
  33.                 };
  34.             }
  35.         int terminalMask = (1 << (n - 1));
  36.         for(int i = k - 2; i >= 0; i--){
  37.                 int maskLeft = 1 << (i + extra);
  38.                 int maskRight = terminalMask;
  39.                 terminalMask ^= maskLeft;
  40.                 int stop = i == 0 ? (1 << extra) - 1 : 0;
  41.                 for(int mask = (1 << extra) - 1; mask >= stop; mask--){
  42.                     int wt = CS[mask ^ terminalMask];
  43.                     int T = INF;
  44.                     for(int submask = mask; ; submask = (submask - 1) & mask){
  45.                         int wtLeft = CS[maskLeft ^ submask];
  46.                         int wtRight = CS[maskRight ^ submask ^ mask];
  47.                         int cut = wt - wtLeft - wtRight;
  48.                         T = min(T, cut + dp[mask ^ submask]);
  49.                         if(!submask) break;
  50.                     }
  51.                     dp[mask] = T;
  52.                 }
  53.             }
  54.         printf("%d\n", dp[(1 << extra) - 1]);
  55.     }
  56. }
Success #stdin #stdout 0s 4392KB
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https://ideone.com/6NvCb8
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
secret

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