1. Two Sum
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2024-02-17 12:25:28
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Given an array of integers, return indices of the two numbers such that they add up to a specific target.
You may assume that each input would have exactly one solution.
Example:
Given nums = [2, 7, 11, 15], target = 9,
Because nums[0] + nums[1] = 2 + 7 = 9,
return [0, 1].
**UPDATE (2016/2/13):
**The return format had been changed to zero-based indices. Please read the above updated description carefully.
Solution
/**
* @param {number[]} nums
* @param {number} target
* @return {number[]}
*/
var twoSum = function(nums, target) {
var len = nums.length;
var result = [];
var hash = [];
for (var i = 0; i< len; i++) {
if (hash[target - nums[i]] !== undefined) {
result[0] = hash[target - nums[i]];
result[1] = i;
return result;
} else {
hash[nums[i]] = i;
}
}
};