提出はしなかったコード

int solve(int i, int bit, string N)
{
  if(i == N.size()) return 0;
  int ret = solve(i+1, bit, N);
  reps(j, i+1, N.size()) reps(k, j+1, N.size()) {
    if(N[i] != '0' && N[j] == N[k]) {
      if((bit >> i)&1 || (bit >> j)&1 || (bit >> k)&1) continue;
      string s = ""; s += N[i]; s += N[j]; s += N[k];      
      int next = bit | (1<<i) | (1<<j) | (1<<k);
      int tmp = solve(i+1, next, N);
      ret = max(ret, tmp + stoi(s));
    }
  }
  return ret;
}

int main()
{
  string N; cin >> N;
  cout << solve(0, 0, N) << endl;
  return 0;
}

commit