Leetcode's two sum problem's solution in rust

code review
1

Kindly review the code the hardway , to optimize and make it efficient.
Stackoverflow link of my code

programming challenge - Solution to LeetCode Two Sum problem in Rust - Code Review Stack Exchange

2

Create a hashmap of target - Vec. Then, instead of iterating through the Vec in the inner loop, just lookup in the hashMap and see if it's Some vs None.

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