adding JudgeRouteCircle.java

company/google/JudgeRouteCircle.java

@@ -0,0 +1,30 @@
+//Initially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot makes a circle, which means it moves back to the original place.
+//
+//The move sequence is represented by a string. And each move is represent by a character. The valid robot moves are R (Right), L (Left), U (Up) and D (down). The output should be true or false representing whether the robot makes a circle.
+//
+//Example 1:
+//Input: "UD"
+//Output: true
+//Example 2:
+//Input: "LL"
+//Output: false
+
+class JudgeRouteCircle {
+    public boolean judgeCircle(String moves) {
+        int UD = 0;
+        int LR = 0;
+        for(int i = 0; i < moves.length(); i++) {
+            if(moves.charAt(i) == 'U') {
+                UD++;
+            } else if(moves.charAt(i) == 'D') {
+                UD--;
+            } else if(moves.charAt(i) == 'L') {
+                LR++;
+            } else if(moves.charAt(i) == 'R') {
+                LR--;
+            }
+        }
+
+        return UD == 0 && LR == 0;
+    }
+}

leetcode/string/JudgeRouteCircle.java

@@ -0,0 +1,30 @@
+//Initially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot makes a circle, which means it moves back to the original place.
+//
+//The move sequence is represented by a string. And each move is represent by a character. The valid robot moves are R (Right), L (Left), U (Up) and D (down). The output should be true or false representing whether the robot makes a circle.
+//
+//Example 1:
+//Input: "UD"
+//Output: true
+//Example 2:
+//Input: "LL"
+//Output: false
+
+class JudgeRouteCircle {
+    public boolean judgeCircle(String moves) {
+        int UD = 0;
+        int LR = 0;
+        for(int i = 0; i < moves.length(); i++) {
+            if(moves.charAt(i) == 'U') {
+                UD++;
+            } else if(moves.charAt(i) == 'D') {
+                UD--;
+            } else if(moves.charAt(i) == 'L') {
+                LR++;
+            } else if(moves.charAt(i) == 'R') {
+                LR--;
+            }
+        }
+
+        return UD == 0 && LR == 0;
+    }
+}