Implement indexOf()

Difficulty: MEDIUM
Avg. time to solve
25 min
Success Rate

Problem Statement
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You are given two strings A and B. Find the index of the first occurrence of A in B. If A is not present in B, then return -1.

For Example:
A = “bc”, B = “abcddbc”.
String “A” is present at index 1, and 5(0-based index), but we will return 1 as it is the first occurrence of “A” in string “B”.
Follow Up:
Can you solve this in linear time and space complexity?
Input format:
The first line contains an integer 'T' which denotes the number of test cases or queries to be run. Then, the T test cases follow.

The first and only line of each test case contains two strings A and B, separated by a single space.
Output format:
For each test case, print the index of the first occurrence of A in B, if string A is not present in string B then print -1.
You do not need to print anything. It has already been taken care of. Just implement the given function.
1 <= T <= 100
1 <= |A|, |B| <= 5 * 10^4 

Time limit: 1 second
Sample Input 1:
ninjas codingninjas
code codingninjas
Sample Output 1:
Explanation For Sample Input 1:
For the first test case, “ninjas” is present at the 6th index of “codingninjas”.

For the second test case, “code” is not present in “codingninjas”.
Sample Input 2:
e add
en engagement
Sample output 2:
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