Catalina :
I am using the below function to converting the sublists of list to 0 and the rest elements to 1 however i am trying to change the data structure to list of tuple.
for example the function provide for the input [1,2,3,5,10] to [0,0,0,1,1]. how can i convert this data structure to get the following output like this: [(0,1),(0,2),(0,3),(1,5),(1,10)] ? Or maybe to another similar data-structure if possible? like list of two element arrays
public static void main(String[] args) {
int[] arr = { 1, 8, 1, 9, 10 };
// assume arr.length >= 2
boolean asc = arr[1] - arr[0] == 1;
for (int i = 1; i < arr.length - 1; i++) {
if (arr[i + 1] - arr[i] == 1) {
arr[i] = 0;
asc = true;
} else {
if (asc) {
asc = false;
arr[i] = 0;
}
else {
arr[i] = 1;
}
}
}
arr[arr.length - 1] = asc ? 0 : 1;
for (int i = 0; i < arr.length; i++) {
System.out.println(arr[i]);
}
}
Joakim Danielson :
You can create a class Tuple to hold your values
public class Tuple {
int first;
boolean second;
public Tuple(int first, boolean second) {
this.first = first;
this.second = second;
}
@Override
public String toString() {
return String.format("(%d, %b)", first, second);
}
}
And then slightly change your code to use it
final int[] arr = { 1, 8, 1, 9, 10 };
Tuple[] result = new Tuple[arr.length];
boolean asc = arr[1] - arr[0] == 1;
result[0] = new Tuple(arr[0], asc);
for (int i = 1; i < arr.length - 1; i++) {
if (arr[i + 1] - arr[i] == 1) {
asc = true;
} else {
if (asc) {
asc = false;
}
}
result[i] = new Tuple(arr[i], asc);
}
result[arr.length - 1] = new Tuple(arr[arr.length - 1], asc);
for (int i = 0; i < arr.length; i++) {
System.out.println(result[i]);
}
This outputs
(1, false)
(8, false)
(1, false)
(9, true)
(10, true)
Note that if/else inside the for loops probably can be improved but since it wasn't essential to the answer I haven't done so myself
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