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package main
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// Time: O(n)
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// Space: O(n)
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func twoSum(nums []int, target int) []int {
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exists := make(map[int]int)
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for i1, num := range nums {
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if i2, ok := exists[target-num]; ok && i1 != i2 {
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return []int{i1, i2}
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}
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exists[num] = i1
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}
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return []int{}
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}
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