* [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 squar
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