Submission #1120378

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120378		vjudge1	Palindrome-Free Numbers (BOI13_numbers)	C++17	44.17 / 100	1074 ms	512 KiB

numbers

#include <bits/stdc++.h>
using namespace std;

bool isPalindrome(const string &str) {
  string s1 = str.substr(0, str.size() / 2 + str.size() % 2);
  string s2 = str.substr(str.size() / 2);
  reverse(s2.begin(), s2.end());
  return s1 == s2;
}

int main() {

  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);

  int a, b, ans = 0;
  cin >> a >> b;
  for (int i = a; i <= b; i++) {
    string str = to_string(i);
    char ok = true;
    for (size_t i = 0; i < str.size(); i++) {
      for (size_t j = 2; j <= str.size() - i; j++) {
        string substr = str.substr(i, j);
        if (isPalindrome(substr)) {
          ok = false;
          break;
        }
      }
      if (!ok) {
        break;
      }
    }
    if (ok) {
      ans++;
    }
  }
  cout << ans << '\n';
}

• Subtask 1: 22.5 / 25
• Subtask 2: 21.666666666666668 / 75