Submission #1120184

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120184		vjudge1	Palindrome-Free Numbers (BOI13_numbers)	C++17	Compilation error	0 ms	0 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);
  ranges::reverse(s2);
  return s1 == s2;
}

template <typename func> bool forAll(const string &str, const func &f) {
  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 (f(substr)) {
        return false;
      }
    }
  }
  return true;
}

int main() {
  int a, b, ans = 0;
  cin >> a >> b;
  for (int i = a; i <= b; i++) {
    string str = to_string(i);
    if (forAll(str, isPalindrome)) {
      ans++;
    }
  }
  cout << ans << '\n';
}

Compilation message (stderr)

numbers.cpp: In function 'bool isPalindrome(const string&)':
numbers.cpp:7:3: error: 'ranges' has not been declared
    7 |   ranges::reverse(s2);
      |   ^~~~~~