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leetcode 0069

admin 11月 13, 2020 0

Desicription

Implement int sqrt(int x).

Compute and return the square root of x.

x is guaranteed to be a non-negative integer.

Example 1:

1 2	Input: 4 Output: 2

Example 2:

1
2
3

Input: 8
Output: 2
Explanation: The square root of 8 is 2.82842..., and since we want to return an integer, the decimal part will be truncated.

class  {
public:
    int mySqrt(int x) {
        long r = x;
        while (r*r > x)
            r = (r + x/r) / 2;
        return r;
    }
};