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| 1 | package ch.claude_martin.playground; | |
| 2 | ||
| 3 | import java.util.*; | |
| 4 | ||
| 5 | public final class SomeClass {
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| 6 | public static void main(String[] args) {
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| 7 | - | int[] a = { 2, 1, 18, -5 };
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| 7 | + | int[] a = {2, 1, 18, -5, -5, -15, 0, 0, 1, -1} ;
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| 8 | int[] pairwiseSum = pairwiseSum(a); | |
| 9 | System.out.println(Arrays.toString(pairwiseSum)); | |
| 10 | } | |
| 11 | ||
| 12 | public static int[] pairwiseSum(int[] a) {
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| 13 | if (Objects.requireNonNull(a, "array can't be null").length % 2 != 0) | |
| 14 | throw new IllegalArgumentException("length must be even");
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| 15 | int[] result = new int[a.length / 2]; | |
| 16 | - | for (int i = 0, k = 0; k < result.length; i = i + 2) {
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| 16 | + | for (int i = 0, k = 0; k < result.length;) {
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| 17 | - | result[k++] = a[i] + a[i + 1]; |
| 17 | + | result[k++] = a[i++] + a[i++]; |
| 18 | } | |
| 19 | return result; | |
| 20 | } | |
| 21 | ||
| 22 | } |
