leetcode/src/s0007_reverse_integer.cpp

#include "s0007_reverse_integer.hpp"

int S0007::reverse(int x) {
  int r{0};
  std::queue<int> queue;

  while (x != 0) {
    queue.push(x % 10);
    x = static_cast<int>((x - (x % 10)) / 10);
  }
  while (!queue.empty()) {
    if (r < INT_MIN / 10 || r > INT_MAX / 10) {
      return 0;
    }
    r = r * 10 + queue.front();
    queue.pop();
  }

  return r;
}