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RangeExtraction.java
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RangeExtraction.java
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/*A format for expressing an ordered list of integers is to use a comma separated list of either
individual integers
or a range of integers denoted by the starting integer separated from the end integer in the range by a dash, '-'. The range includes all integers in the interval including both endpoints. It is not considered a range unless it spans at least 3 numbers. For example ("12, 13, 15-17")
Complete the solution so that it takes a list of integers in increasing order and returns a correctly formatted string in the range format.
Example:
Solution.rangeExtraction(new int[] {-6, -3, -2, -1, 0, 1, 3, 4, 5, 7, 8, 9, 10, 11, 14, 15, 17, 18, 19, 20})
# returns "-6,-3-1,3-5,7-11,14,15,17-20"*/
import java.util.Arrays;
class Solution {
public static String rangeExtraction(int[] arr) {
int count =0;
String newString ="";
for (int i = 0; i < arr.length-1; i++) {
if(arr[i]+1==arr[i+1]) {
count++;
if(i==arr.length-2 && count>=2) {
newString+=arr[i-count+1];
newString+="-"+arr[i+1];
}if(i==arr.length-2 && count==1) {
newString+=arr[i]+",";
newString+=arr[i+1];
}
//System.out.println(count);
}else {
if(count>=2) {
newString+=arr[i-count];
newString+="-"+arr[i]+",";
//newString+=arr[i]+",";
if(i==arr.length-2) {
newString+=arr[i+1];
}
} if(count ==1) {
newString+=arr[i-1]+",";
newString+=arr[i]+",";
if(i==arr.length-2) {
newString+=arr[i+1];
}
} if(count==0) {
newString+=arr[i]+",";
if(i==arr.length-2) {
newString+=arr[i+1];
}
}
count=0;
}
}
return newString;
}
}