633. Sum of Square Numbers

class Solution {
public:
    bool judgeSquareSum(int c) {
        long s=0, e=sqrt(c);
        if(c==1)
          e=c;

        while(s<=e)
        {
            if(((s*s)+(e*e))==c)
            return true;

            else if(((s*s)+(e*e))> c)
              e--;
            else
              s++;
        }
        return false;
    }
};