[leetcode]Summary Range

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public class Solution { public List<String> summaryRanges(int[] nums) { List<String> result = new ArrayList<String>(); if (nums == null || nums.length == 0) return result; int prev = 0; int current = 1; while (current < nums.length){ if (nums[current] != nums[current-1]+1){ result.add(generateRange(nums[prev], nums[current-1])); prev = current; } current++; } result.add(generateRange(nums[prev], nums[current-1])); return result; } private String generateRange(int from, int to){ return from==to?""+from:from+"->"+to; } }