Problem
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
class Solution { public boolean isStrobogrammatic(String s) { //69, 88, 00, 11, 6969, 698869, 69869, 6908069, 886988 Mapmap = new HashMap<>(); map.put("6", "9"); map.put("9", "6"); map.put("0", "0"); map.put("1", "1"); map.put("8", "8"); int i = 0, j = s.length()-1; while (i <= j) { if (!map.containsKey(s.charAt(i))) return false; if (map.get(s.charAt(i++)) != s.charAt(j--)) return false; } return true; } }
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