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Solution: Two Sum
Problem Statement
You are given an array of integers nums
and an integer target
. Your task is to find two distinct indices i
and j
such that the sum of nums[i]
and nums[j]
is equal to the target
. You can assume that each input will have exactly one solution, and you may not use the same element twice.
Examples

Example 1:
 Input:
[3, 2, 4]
,6
 Expected Output:
[1, 2]
 Justification:
nums[1] + nums[2]
gives2 + 4
which equals6
.
 Input:

Example 2:
 Input:
[1, 2, 3, 4, 5]
,8
 Expected Output:
[2, 4]
 Justification:
 Input:
.....
.....
.....
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