g0001_0100.s0001_two_sum.Solution.kt Maven / Gradle / Ivy

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Kotlin-based LeetCode algorithm problem solutions, regularly updated

There is a newer version: 1.30

package g0001_0100.s0001_two_sum

// #Easy #Top_100_Liked_Questions #Top_Interview_Questions #Array #Hash_Table
// #Data_Structure_I_Day_2_Array #Level_1_Day_13_Hashmap #Udemy_Arrays #Big_O_Time_O(n)_Space_O(n)
// #2023_07_03_Time_202_ms_(91.18%)_Space_38.1_MB_(76.07%)

class Solution {
    fun twoSum(numbers: IntArray, target: Int): IntArray {
        val indexMap: MutableMap = HashMap()
        for (i in numbers.indices) {
            val requiredNum = target - numbers[i]
            if (indexMap.containsKey(requiredNum)) {
                return intArrayOf(indexMap.getValue(requiredNum), i)
            }
            indexMap[numbers[i]] = i
        }
        return intArrayOf(-1, -1)
    }
}