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  • Strobogrammatic Number

    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('1','1');
            map.put('0','0');
            map.put('6','9');
            map.put('9','6');
            map.put('8','8');
            int left = 0, right = num.length() - 1;
            while(left <= right){
                // 如果字母不存在映射或映射不对,则返回假
                if(!map.containsKey(num.charAt(right)) || num.charAt(left) != map.get(num.charAt(right))){
                    return false;
                }
                left++;
                right--;
            }
            return true;
        }
    }
    

      

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  • 原文地址:https://www.cnblogs.com/apanda009/p/7903593.html
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