Leetcode 228 Summary Ranges

Given a sorted integer array without duplicates, return the summary of its ranges.

For example, given

[0,1,2,4,5,7]

, return

["0->2","4->5","7"].

类似于 Leetcode 38 Count and Say 在末端增加特殊符号标志结束

在循环中如果发现不是连续整数则分情况放入结果数组

var summaryRanges = function(nums) {
var t = 0
var ans = []
nums.push('#')
for(var i=1;i<nums.length;i++)
if(nums[i]-nums[t] !== i-t){
if(i-t>1)
ans.push(nums[t]+'->'+(nums[i-1]))
else
ans.push(nums[t].toString())
t = i
}
return ans
}