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246. 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.246. Strobogrammatic Number
public class Solution { public boolean isStrobogrammatic(String nums) { // 6 - > 9 , 9 - > 6 , 1 - > 1, 8 - > 8, 0 -> 0 int array[] = {0, 1, 0, 0, 0, 0 ,9, 0, 8, 6}; String res = ""; for(int i = nums.length() - 1 ; i >= 0; i--){ if(nums.charAt(i) - ‘0‘ >= 0 && nums.charAt(i) - ‘0‘ <= 9 ){ res = res + array[nums.charAt(i) - ‘0‘] ; } else return false; } return res.equals(nums); } //2 pointer O(n/2) ---method 2 public boolean isStrobogrammatic(String nums) { int i = 0; int j = nums.length() - 1; while(i <= j){ if(isPair(nums.charAt(i), nums.charAt(j))){ i++; j--; } else return false; } return true; } public boolean isPair(char num1 , char num2){ if(num1 == ‘6‘ && num2 == ‘9‘ || num1 == ‘9‘ && num2 == ‘6‘ || num1 == ‘8‘ && num2 == ‘8‘ || num1 == ‘1‘ && num2 == ‘1‘|| num1 == ‘0‘ && num2 == ‘0‘) return true; else return false; }}
246. Strobogrammatic Number
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