Problem:
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.
思路：
Solution (C++):
int mySqrt(int x) {
if (x == 0) return 0;
int root = 1;
while (root) {
if (x / root >= root && x / (root+1) < (root+1)) return root;
++root;
}
return root;
}
性能：
Runtime: 152 ms Memory Usage: 6.1 MB
思路：
Solution (C++):
性能：
Runtime: ms Memory Usage: MB
