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Two Number Indices Solution

You are given an array of integers `nums` and an integer `target`. Return the indices of the two numbers in the array that add up to `target`.

Example 1

{"nums":[2,7,11,15],"target":9}

[0,1]

Explanation: Because `nums[0] + nums[1] == 2 + 7 == 9`, we return `[0, 1]`.

Example 2

{"nums":[3,2,4],"target":6}

[1,2]

Explanation: Because `nums[1] + nums[2] == 2 + 4 == 6`, we return `[1, 2]`.

Example 3

{"nums":[3,3],"target":6}

[0,1]

Explanation: Because `nums[0] + nums[1] == 3 + 3 == 6`, we return `[0, 1]`.