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  1. public class BearDestroysDiv2 {
  2.  
  3.     int mod;
  4.  
  5.     public class Pair {
  6.         public long sum;
  7.         public long times;
  8.         public Pair(long sum, long times) {
  9.             this.sum = sum;
  10.             this.times = times;
  11.         }
  12.         public void modulo() {
  13.             sum %= mod;
  14.             times %= mod;
  15.         }
  16.     }
  17.  
  18.     public int sumUp(int W, int H, int mod_tmp) {
  19. 		mod = mod_tmp;
  20.         final int M = 1 << (W + 1);
  21.         Pair dp[] = new Pair[M];
  22.         Pair old[] = new Pair[M];
  23.         for(int i = 0; i < M; ++i) dp[i] = new Pair(0L,0L);
  24.         dp[0] = new Pair(0L, 1L);
  25.         int x = 0, y = 0;
  26.         while(true) {
  27.             for(int mask = 0; mask < M; ++mask) {
  28.                 old[mask] = new Pair(dp[mask].sum, dp[mask].times);
  29.                 dp[mask] = new Pair(0L, 0L);
  30.             }
  31.             for(int mask = 0; mask < M; ++mask) {
  32.                 Pair me = old[mask];
  33.                 Boolean right = (0 == (mask & 2) && x != W-1);
  34.                 Boolean down = (0 == (mask & (1 << W)) && y != H-1);
  35.                 if(0 != (mask & 1) || (!right && !down)) {
  36.                     int m = mask / 2;
  37.                     dp[m].sum += 2 * me.sum;
  38.                     dp[m].times += 2 * me.times;
  39.                     dp[m].modulo();
  40.                     continue;
  41.                 }
  42.                 Boolean prefer = false;
  43.                 for(int hack = 0; hack < 2; ++hack) {
  44.                     int m;
  45.  
  46.                     if(right && (prefer || !down))
  47.                         m = mask / 2 + 1;
  48.                     else
  49.                         m = mask / 2 + (1 << (W - 1));
  50.                     dp[m].sum += me.sum + me.times;
  51.                     dp[m].times += me.times;
  52.                     dp[m].modulo();
  53.                     prefer = true;
  54.                 }
  55.             }
  56.             ++x;
  57.             if(x == W) {
  58.                 x = 0;
  59.                 ++y;
  60.             }
  61.             if(y == H) return (int) dp[0].sum;
  62.         }
  63.     }
  64. }
  65.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:1: error: class BearDestroysDiv2 is public, should be declared in a file named BearDestroysDiv2.java
public class BearDestroysDiv2 {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/ZXycxG
div2hard
language:
Java (12.0.1)
created:
8 years ago
visibility:
secret

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