Two Sum LeetCode - Javascript Solve the algorithm Problem
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Hello and welcome to this video, where we'll be discussing how to solve the Two Sum algorithm in JavaScript.
The Two Sum algorithm is a classic coding challenge where you're given an array of numbers and a target value, and you need to find two numbers in the array that add up to the target value.
We use two nested for loops to iterate over all pairs of elements in the input array nums.
For each pair (nums[i], nums[j]) where j will be starting at i+1. we check if their sum equals the target. If it does, we return an array with the indices i and j.
Now let’s optimize this
We create an empty Map to store the elements of the input array and their indices. We will use this map to quickly check if the complement of the current element is already in the map.
We loop through the input array nums, and for each element nums[i], we compute the complement target - nums[i].
We check if the complement is already in the map. If it is, we return an array with the indices of the complement and the current element ([map.get(complement), i]). Note that we return the indices in the order of the input array, which is not necessarily the order in which the elements appear in the array.
If the complement is not in the map, we add the current element to the map with its index as the value (map.set(nums[i], i)).
#javascript #algorithms #algorithmpractice #algorithmjavascript #leetcodequestionandanswers
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