Merge pull request 'Programming example sum of squares' (#5) from 5-changes-from-2022-02-13 into main
Reviewed-on: #5
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fa1a9b75fc
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@ -0,0 +1,8 @@
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package space.dezentrale.prgrnd
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class SumOfSquares {
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fun calculate(intArray: IntArray): Int {
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return intArray.sumOf { it * it }
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}
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}
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@ -13,12 +13,12 @@ class SumOfTwo {
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}
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fun optimalSolution(nums: IntArray, target: Int): IntArray {
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val numsToIndices = nums.mapIndexed { index: Int, num: Int -> num to index }.toMap()
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println("numsToIndices = $numsToIndices")
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val numsToIndices = mutableMapOf<Int, Int>()
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for ((index, num) in nums.withIndex()) {
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if (numsToIndices.containsValue(target - num)) {
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return intArrayOf(numsToIndices[target - num]!!, index)
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}
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numsToIndices[target] = index
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}
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return intArrayOf(-1, -1)
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}
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package space.dezentrale.prgrnd
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import kotlin.test.Test
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import kotlin.test.assertEquals
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class SumOfSquaresTest {
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@Test
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fun `it calculates sum of one`() {
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val sumOfSquares = SumOfSquares()
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assertEquals(4, sumOfSquares.calculate(intArrayOf(-2)))
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}
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@Test
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fun `it calculates sum of two`() {
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val sumOfSquares = SumOfSquares()
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assertEquals(13, sumOfSquares.calculate(intArrayOf(-2, 3)))
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}
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}
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@ -10,7 +10,7 @@ class SumOfTwoTest {
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val twoSum = sumOfTwo.simpleSolution(intArrayOf(2, 7, 11, 15), 9)
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assertContentEquals(twoSum, intArrayOf(0, 1))
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assertContentEquals(intArrayOf(0, 1), twoSum)
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}
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@Test
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@ -19,7 +19,7 @@ class SumOfTwoTest {
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val twoSum = sumOfTwo.simpleSolution(intArrayOf(3, 2, 4), 6)
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assertContentEquals(twoSum, intArrayOf(1, 2))
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assertContentEquals(intArrayOf(1, 2), twoSum)
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}
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@Test
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@ -28,7 +28,7 @@ class SumOfTwoTest {
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val twoSum = sumOfTwo.simpleSolution(intArrayOf(3, 3), 6)
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assertContentEquals(twoSum, intArrayOf(0, 1))
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assertContentEquals(intArrayOf(0, 1), twoSum)
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}
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@Test
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@ -37,7 +37,7 @@ class SumOfTwoTest {
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val twoSum = sumOfTwo.optimalSolution(intArrayOf(2, 7, 11, 15), 9)
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assertContentEquals(twoSum, intArrayOf(0, 1))
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assertContentEquals(intArrayOf(0, 1), twoSum)
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}
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@Test
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@ -46,7 +46,7 @@ class SumOfTwoTest {
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val twoSum = sumOfTwo.optimalSolution(intArrayOf(3, 2, 4), 6)
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assertContentEquals(twoSum, intArrayOf(1, 2))
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assertContentEquals(intArrayOf(1, 2), twoSum)
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}
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@Test
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@ -55,6 +55,6 @@ class SumOfTwoTest {
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val twoSum = sumOfTwo.optimalSolution(intArrayOf(3, 3), 6)
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assertContentEquals(twoSum, intArrayOf(0, 1))
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assertContentEquals(intArrayOf(0, 1), twoSum)
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}
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}
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