How to Solve Array Reduce Transformation Problem
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Array Reduce Transformation
Given an integer array nums, a reducer function fn, and an initial value init, return the final result obtained by executing the fn function on each element of the array, sequentially, passing in the ...
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Understanding the Array Reduce Transformation Problem
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Problem Statement
Given an integer array nums, a reducer function fn, and an initial value init, return the final result obtained by executing the fn function on each element of the array, sequentially, passing in the return value from the calculation on the preceding element. This result is achieved through the following operations: val = fn(init, nums[0]), val = fn(val, nums[1]), val = fn(val, nums[2]), ... until every element in the array has been processed. The ultimate value of val is then returned. If the length of the array is 0, the function should return init. Please solve it without using the built-in Array.reduce method.
Array Reduce Transformation
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Examples
Example input10initially, the value is init=0. (0) + nums[0] = 1 (1) + nums[1] = 3 (3) + nums[2] = 6 (6) + nums[3] = 10 The final answer is 10.
Example input130initially, the value is init=100. (100) + nums[0] * nums[0] = 101 (101) + nums[1] * nums[1] = 105 (105) + nums[2] * nums[2] = 114 (114) + nums[3] * nums[3] = 130 The final answer is 130.
Example input25For empty arrays, the answer is always init.
Constraints
0 <= nums.length <= 10000 <= nums[i] <= 10000 <= init <= 1000How Interview Coder Helps with Leetcode Problems
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