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code-problems/leetcode/7_reverse_integer.cpp at master · letscode-io/code-problems · GitHub

31 lines (27 loc) · 540 Bytes

#include <climits>
#include <cmath>
class Solution
    int reverse(int x)
        if (INT_MIN == x)
            return 0;
        int result = 0;
        int multiplier = x < 0 ? -1 : 1;
        x = abs(x);
        while (x != 0)
            if (result > 0 && (INT_MAX / result) < 10)
                return 0;
            int rem = x % 10;
            result = (result * 10) + rem;
            x = x / 10;
        return result * multiplier;

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