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.
For example, the numbers "69", "88", and "818" are all strobogrammatic.
public class Solution { public boolean isStrobogrammatic(String num) { HashMap<Character, Character> map = new HashMap<Character, Character>(); map.put('6','9'); map.put('9','6'); map.put('8','8'); map.put('0','0'); map.put('1','1'); int left = 0; int right = num.length()-1; while(left<=right) { char c1 = num.charAt(left); char c2 = num.charAt(right); if(!map.containsKey(c1)||map.get(c1)!=c2) return false; left++; right--; } return true; } }
转载于:https://www.cnblogs.com/hygeia/p/5104299.html
