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JudgeRouteCircle.java
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30 lines (28 loc) · 1010 Bytes
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//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;
}
}