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class Solution {
public:
    int reverse(int x) {
        if (x == 0) return 0;
        int ret = 0;
        while (x != 0) {
            int tmp = ret * 10 + x % 10;
            if (tmp / 10 != ret) return 0;
            ret = tmp;
            x /= 10;
        }
        return ret;
    }
};