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package class29;
public class Problem_0069_SqrtX {
// x一定非负，输入可以保证
public static int mySqrt(int x) {
if (x == 0) {
return 0;
}
if (x < 3) {
return 1;
// x >= 3
long ans = 1;
long L = 1;
long R = x;
long M = 0;
while (L <= R) {
M = (L + R) / 2;
if (M * M <= x) {
ans = M;
L = M + 1;
} else {
R = M - 1;
return (int) ans;
