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   | class Solution {     public boolean judgeCircle(String moves) {         int x = 0, y = 0;         for (char ch : moves.toCharArray()) {             if (ch == 'R') {                 x++;             } else if (ch == 'L') {                 x--;             } else if (ch == 'U') {                 y--;             } else if (ch == 'D') {                 y++;             }         }         return x == 0 && y == 0;     } }
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