Simple C++ using math


  • -5
    U
    class Solution {
    public:
        bool isPerfectSquare(int num) {
            if(num <= 0)return false;
            int sq = sqrt(num);
            return (sq*sq == num);
        }
    };

  • 0
    4

    Obviously, with sqrt, the question looks trivial.
    You should not use it.

    "Note: Do not use any built-in library function such as sqrt."


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