KLG
0
Given arr1: [0, 1, -1, 3, -1],
and arr2: [15, 15, 10, 20, 20],
how can I create this 2D array:
[[0, 15], [1, 15], [3, 20]]
You'll notice that I'm trying to exclude -1 values and their corresponding values in the same indices between both arrays.
I'm thinking create a copy of arr1 that excludes -1 values but I'm not sure how to go from there.
you can try:
public static void main(String[] args) {
int[] arr1 = new int[]{0, 1, -1, 3, -1};
int[] arr2 = new int[]{15, 15, 10, 20, 20};
long length1 = Arrays.stream(arr1).filter(i -> i != -1).count();
long length2 = Arrays.stream(arr2).filter(i -> i != -1).count();
int index = 0;
int resultLength = Math.toIntExact(Math.min(length1, length2));
int[][] result = new int[resultLength][2];
for (int i = 0; i < arr1.length; i++) {
if (arr1[i] != -1 && arr2[i] != -1) {
result[index][0] = arr1[i];
result[index][1] = arr2[i];
index ++;
}
}
// Result: [[0, 15], [1, 15], [3, 20]]
System.out.println(Arrays.deepToString(result));
}
Assuming your arrays have always the same length and both arrays could contain negative values, try something like below:
int[] arr1 = {0, 1, -1, 3, -1};
int[] arr2 = {15, 15, 10, 20, 20};
int[][] result = IntStream.range(0, arr1.length)
.filter(i -> arr1[i] >= 0 && arr2[i] > 0)
.mapToObj(i -> new int[]{arr1[i], arr2[i]})
.toArray(int[][]::new);
System.out.println(Arrays.deepToString(result));
Assuming you are looking for excluding values which are negative from arr1, then below is one of option:
int[] arr1 = { 0, 1, -1, 3, -1 };
int[] arr2 = { 15, 15, 10, 20, 20 };
int arr3[][] = new int[(int) Arrays.stream(arr1).filter(x -> x >= 0).count()][2];
int k = 0, j = 0;
for (int i = 0; i < arr1.length; i++) {
if (arr1[i] >= 0) {
arr3[j][k++] = arr1[i];
arr3[j][k--] = arr2[i];
j++;
}
}
System.out.println(Arrays.deepToString(arr3));