works/solutions/leetcode/cpp/7.cpp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

class Solution
{
public:
    int reverse(int x)
    {
        int result = 0;
        while (x != 0)
        {
            int digit = x % 10;
            x /= 10;
            if (__builtin_smul_overflow(result, 10, &result))
                return 0;
            if (__builtin_sadd_overflow(result, digit, &result))
                return 0;
        }
        return result;
    }
};