83101614
5
2
8
1
9
3
012345
O(log n)
O(n²)
O(n log n)
O(1)
A
D
G
B
push()
pop()
peek()
isEmpty()
while (left < right) {
mid = (left + right) / 2
if (arr[mid] == target)
return mid
}
1
2
3
4
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