Functions of StringBuilder:
代码：
public class Solution {
public List<String> summaryRanges(int[] nums) {
List<String> list = new ArrayList<>();
if(nums.length == 0) return list;
int head = 0;
int k = -1;
StringBuilder sb = new StringBuilder();
for(int i = 0; i < nums.length; i++){
if(i == 0){
sb.append(nums[i]);
if(i == nums.length-1){
list.add(sb.toString());
break;
}
sb.append(‘,‘);
head = nums[i];
}
else if(nums[i] > head + 1){
String[] tokens = sb.toString().split(",");
if(tokens.length == 1) list.add(tokens[0]);
if(tokens.length > 1){
String s = tokens[0]+"->"+tokens[tokens.length-1];
list.add(s);
}
sb = new StringBuilder();
sb.append(nums[i]);
if(i == nums.length-1){
list.add(sb.toString());
break;
}
sb.append(‘,‘);
head = nums[i];
}
else{
sb.append(nums[i]);
if(i == nums.length-1){
String[] tokens = sb.toString().split(",");
String s = tokens[0]+"->"+tokens[tokens.length-1];
list.add(s);
break;
}
sb.append(‘,‘);
head = nums[i];
}
}
return list;
}
}
网上的代码：
public class Solution { public List<String> summaryRanges(int[] nums) { List<String> list = new ArrayList<>(); if(nums.length == 0) return list; int high = 0, low = 0; int length = nums.length; //int k = -1; while(high < length){ if(high < length-1 && nums[high]+1 == nums[high+1]){ high++; } else{ if(low == high) list.add(String.valueOf(nums[high])); else list.add(nums[low]+"->"+nums[high]); high++; low = high; } } return list; } }
Jan 12 - Summary Ranges;Array;String
原文：http://www.cnblogs.com/5683yue/p/5126121.html