69. Sqrt(x)(js)
69. Sqrt(x)
Implement int sqrt(int x)
.
Compute and return the square root of x, where x is guaranteed to be a non-negative integer.
Since the return type is an integer, the decimal digits are truncated and only the integer part of the result is returned.
Example 1:
Input: 4 Output: 2
Example 2:
Input: 8 Output: 2 Explanation: The square root of 8 is 2.82842..., and since the decimal part is truncated, 2 is returned.
题意:给给定数字开平方
代码如下:
/** * @param {number} x * @return {number} */ var mySqrt = function(x) { if(x<4) return x==0 ? 0:1; var res=2*mySqrt(x/4) if((res+1)*(res+1)<=x && (res+1)*(res+1)>=0) return res+1; return res; };
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