How to Solve Find the Middle Index in Array Problem
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Find the Middle Index in Array
Given a 0-indexed integer array nums, find the leftmost middleIndex (i.e., the smallest amongst all the possible ones). A middleIndex is an index where nums[0] + nums[1] + ... + nums[middleIndex-1] ==...
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Understanding the Find the Middle Index in Array Problem
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Problem Statement
Given a 0-indexed integer array nums, find the leftmost middleIndex (i.e., the smallest amongst all the possible ones). A middleIndex is an index where nums[0] + nums[1] + ... + nums[middleIndex-1] == nums[middleIndex+1] + nums[middleIndex+2] + ... + nums[nums.length-1]. If middleIndex == 0, the left side sum is considered to be 0. Similarly, if middleIndex == nums.length - 1, the right side sum is considered to be 0. Return the leftmost middleIndex that satisfies the condition, or -1 if there is no such index.
Find the Middle Index in Array
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Examples
nums = [2,3,-1,8,4]3The sum of the numbers before index 3 is: 2 + 3 + -1 = 4 The sum of the numbers after index 3 is: 4 = 4
nums = [1,-1,4]2The sum of the numbers before index 2 is: 1 + -1 = 0 The sum of the numbers after index 2 is: 0
nums = [2,5]-1There is no valid middleIndex.
Constraints
1 <= nums.length <= 1001000 <= nums[i] <= 1000How Interview Coder Helps with Leetcode Problems
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