Description

Binary Search Challenge

Problem Description

Implement a binary search algorithm to find a target value in a sorted array of integers.

Task

Write a function binarySearch(arr, target) that takes two parameters:

• arr: A sorted array of integers in ascending order
• target: The integer value to search for in the array

The function should return:

• The index of the target value if it exists in the array
• -1 if the target value is not found in the array

Input

• The first line contains an integer n (1 ≤ n ≤ 10^5), the number of elements in the array.
• The second line contains n space-separated integers a_i (-10^9 ≤ a_i ≤ 10^9), representing the sorted array.
• The third line contains an integer q (1 ≤ q ≤ 10^5), the number of queries.
• Each of the next q lines contains a single integer t_i (-10^9 ≤ t_i ≤ 10^9), the target value to search for.

Output

For each query, output a single integer on a new line:

• The index (0-based) of the target value in the array if found
• -1 if the target value is not in the array

Constraints

• Time limit per test: 3 second
• Memory limit per test: 256 megabytes

Sample Input

10 -5 -2 0 3 6 9 11 14 18 21 11

Sample Output

6

Start & End Times

Problems

No problems available.

Scoring

Partial Credit — Ranked

Standings

• Standings are shown without limitation.

Languages

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