Judge Route Circle (Easy/657)
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.
public boolean judgeCircle(String moves) {
int x=0,y=0;
for(int i = 0; i < moves.length(); i++){
char c=moves.charAt(i);
switch(c){
case 'U':
y++;
break;
case 'D':
y--;
break;
case 'L':
x--;
break;
case 'R':
x++;
break;
}
}
if(x==0&&y==0) return true;
return false;
}