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
}