reverse Integer

class Solution {public:    int reverse(int x) {        // Start typing your C/C++ solution below        // DO NOT write int main() function        bool flag=true;        if(x<0) flag=false;        vector<int> v;        while(x){            v.push_back(x%10);            x/=10;        }        int sum=0;        for(int i=0;i<v.size();i++)            sum=sum*10+v[i];        return sum;    }};