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A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down).
Write a function to determine if a number is strobogrammatic. The number is represented as a string.
Example 1:
Input: "69"Output: true
Example 2:
Input: "88"Output: true
Example 3:
Input: "962"Output: false
strobogramatic数字是旋转180度时看起来相同的数字(上下颠倒)。
写一个函数来确定一个数字是否是频闪的。数字用字符串表示。
例1:
输入:“69”
输出:true
例2:
输入:“88”
输出:真
例3:
输入:“962”
输出:false
1 class Solution { 2func isStrobogrammatic(_ num:String) -> Bool { 3 var m:[Character:Character] = ["0":"0","1":"1","8":"8","6":"9","9":"6"] 4 let len = num.count 5 for i in 0...len/2 6 { 7 if m[num[i]] != num[len - i - 1] 8 { 9 return false10 }11 }12 return true13}14 }15 16 extension String { 17//subscript函数可以检索数组中的值18//直接按照索引方式截取指定索引的字符19subscript (_ i: Int) -> Character {20 //读取字符21 get {return self[index(startIndex, offsetBy: i)]}22}23 }
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