https://leetcode.cn/problems/two-sum/
/**
* @param {number[]} nums
* @param {number} target
* @return {number[]}
*/
var twoSum = function(nums, target) {
let diffs = {};
for (let i = 0; i < nums.length; i++) {
let item = target - nums[i];
if (diffs[item] !== undefined) {
return [diffs[item], i];
}
diffs[nums[i]] = i;
}
};
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