42 lines
1.5 KiB
Java
42 lines
1.5 KiB
Java
public class Range{
|
|
public static void main(String[] args){
|
|
System.out.println(compress2Range("-6, -3, -2, -1, 0, 1, 3, 4, 5, 7," +
|
|
" 8, 9, 10, 11, 14, 15, 17, 18, 19, 20"));
|
|
System.out.println(compress2Range(
|
|
"0, 1, 2, 4, 6, 7, 8, 11, 12, 14, " +
|
|
"15, 16, 17, 18, 19, 20, 21, 22, 23, 24," +
|
|
"25, 27, 28, 29, 30, 31, 32, 33, 35, 36," +
|
|
"37, 38, 39"));
|
|
}
|
|
|
|
private static String compress2Range(String expanded){
|
|
StringBuilder result = new StringBuilder();
|
|
String[] nums = expanded.replace(" ", "").split(",");
|
|
int firstNum = Integer.parseInt(nums[0]);
|
|
int rangeSize = 0;
|
|
for(int i = 1; i < nums.length; i++){
|
|
int thisNum = Integer.parseInt(nums[i]);
|
|
if(thisNum - firstNum - rangeSize == 1){
|
|
rangeSize++;
|
|
}else{
|
|
if(rangeSize != 0){
|
|
result.append(firstNum).append((rangeSize == 1) ? ",": "-")
|
|
.append(firstNum+rangeSize).append(",");
|
|
rangeSize = 0;
|
|
}else{
|
|
result.append(firstNum).append(",");
|
|
}
|
|
firstNum = thisNum;
|
|
}
|
|
}
|
|
if(rangeSize != 0){
|
|
result.append(firstNum).append((rangeSize == 1) ? "," : "-").
|
|
append(firstNum + rangeSize);
|
|
rangeSize = 0;
|
|
} else {
|
|
result.append(firstNum);
|
|
}
|
|
return result.toString();
|
|
}
|
|
}
|