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メモ化再帰

int dp[50][50];

int f(int index, int a){
  if(index == k){
    return 1;
  }

  if(dp[index][a] != -1){
    return dp[index][a];
  }

  int ret = 0;

  for(int i = 0; i < n; i++){
    
  }

  dp[index][a] = ret;

  return ret;
}


memset(dp, -1, sizeof(dp));

f(0, 0);

inserted by FC2 system