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package class030;
// 测试链接：https://leetcode.com/problems/sqrtx
public class Code02_MySqrt {
public static int mySqrt(int x) {
if (x == 0) {
return 0;
}
if (x < 3) {
return 1;
long ans = 1;
long L = 1;
long R = x;
long M = 0;
// L...R 1....x
while (L <= R) {
M = (L + R) / 2;
if (M * M <= x) {
ans = M;
L = M + 1;
} else {
R = M - 1;
return (int) ans;
