7. Reverse Integer

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Reverse digits of an integer.

Example1: x = 123, return 321
Example2: x = -123, return -321


public class Solution {    public int reverse(int x) {        int flag=x>0?1:-1;x*=flag;long re=0;while(x>0){re=re*10+x%10;x/=10;}if(re>Integer.MAX_VALUE)return 0;return (int)re*flag;    }}


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