JavaScript is one of the most important languages in web development, and its significance is further highlighted in algorithm problem solving. Many companies evaluate applicants’ problem-solving skills and coding abilities through coding tests. This article will detail the overall approach to coding tests and the problem-solving process through algorithm problems that can be solved with JavaScript.<\/p>\n
Given an integer array For example:<\/p>\n To solve this problem, you can take the following approach.<\/p>\n The code above defines the Using a hashmap to solve the problem was efficient. The reason is that the code operates with a complexity of O(n), allowing it to respond quickly to all input cases. By solving various problems and understanding the solutions while preparing for coding tests, you can gain a deep understanding of algorithms and data structures.<\/p>\n Success in JavaScript coding tests relies on the ability to read and understand problems, as well as the ability to select appropriate algorithms. The sum of two numbers problem discussed today is not particularly complex, but it serves as good practice for developing algorithmic thinking. Keep solving more problems to improve your skills!<\/p>\n <\/body><\/p>\n","protected":false},"excerpt":{"rendered":"nums<\/code> and an integer target<\/code>, write a function that returns the indices of the two numbers in the array that add up to target<\/code>.<\/p>\n\n
nums = [2, 7, 11, 15]<\/code> and target = 9<\/code>, it should return [0, 1]<\/code>. (2 + 7 = 9)<\/li>\n<\/ul>\nApproach to the Problem<\/h2>\n
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target<\/code> exists in the hashmap. The time complexity of this method is O(n).<\/li>\n<\/ol>\nSolution: Code using Hashmap<\/h2>\n
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function twoSum(nums, target) {\n const map = new Map(); \/\/ Initialize the hashmap\n\n for (let i = 0; i < nums.length; i++) {\n const complement = target - nums[i]; \/\/ Calculate the required value\n\n if (map.has(complement)) {\n return [map.get(complement), i]; \/\/ Return the indices\n }\n \n map.set(nums[i], i); \/\/ Add the current number to the hashmap\n }\n \n return []; \/\/ Return an empty array if no result is found\n}<\/code>\n<\/pre>\n<\/div>\nCode Explanation<\/h2>\n
twoSum<\/code> function. The function takes two parameters: an integer array nums<\/code> and an integer target<\/code>.<\/p>\n\n
nums<\/code>.<\/li>\ncomplement<\/code> for each number. (The result of subtracting the current value from the target value)<\/li>\ncomplement<\/code>. If it does, return the current index and the stored index.<\/li>\nReview<\/h2>\n
Conclusion<\/h2>\n