Leetcode :(Remove Duplicates From the Sorted Array)
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LeetCode :-(Two Sum) Problem
import java . util . HashMap ; import java . util . Map ; class TwoSum { // Time complexity: O(n) private static int [ ] findTwoSum ( int [ ] nums , int target ) { Map < Integer , Integer > numMap = new HashMap < > ( ) ; for ( int i = 0 ; i < nums . length ; i ++ ) { int complement = target - nums [ i ] ; if ( numMap . containsKey ( complement ) ) { return new int [ ] { numMap . get ( complement ) , i } ; } else { numMap . put ( nums [ i ] , i ) ; } } return new int [ ] { } ; } }