double mysqrt(double y)
{
double start = 0, mid, end = y;
while (fabs(mid*mid - y) >= 0.001) {
mid = (start + end) / 2;
if (mid*mid > y)
end = mid - 1;
else
start = mid + 1;
}
return mid;
}double mysqrt(double y)
{
double start = 0
阅读背景：
折半查找思想应用——计算平方根和x的n次幂
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