EASY/src/easy/StrobogrammaticNumber.java

fishercoder1534 · fishercoder1534 · commit 85cde5c62487 · 2016-08-29T21:33:17.000-07:00
diff --git a/EASY/src/easy/StrobogrammaticNumber.java b/EASY/src/easy/StrobogrammaticNumber.java
@@ -0,0 +1,29 @@
+package easy;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class StrobogrammaticNumber {
+    public boolean isStrobogrammatic(String num) {
+        Set<Character> set = new HashSet();
+        set.add('0');
+        set.add('1');
+        set.add('6');
+        set.add('8');
+        set.add('9');
+        char[] nums = num.toCharArray();
+        int i = 0, j = num.length()-1;
+        while(i <= j){
+            if(!set.contains(nums[i]) || !set.contains(nums[j])) return false;
+            if(nums[i] == '6' && nums[j] != '9') return false;
+            else if(nums[i] == '9' && nums[j] != '6') return false;
+            else if(nums[i] == '1' && nums[j] != '1') return false;
+            else if(nums[i] == '8' && nums[j] != '8') return false;
+            else if(nums[i] == '0' && nums[j] != '0') return false;
+            else {
+                i++; j--;
+            }
+        }
+        return true;
+    }
+}
