657. Judge Route Circle
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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 tothe original place.
The move sequence is represented by a string. And each move is represent by a character. The valid robot moves areR
(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
bool judgeCircle(char* moves) {
int i;int m=0,n=0;
for(i=0;moves[i]!='\0';i++){
switch(moves[i]){
case 'L': //向左
n--;
break;
case 'R': //向右
n++;
break;
case 'U':
m--;
break;
case 'D':
m++;
break;
}
}
if(m==0 && n==0) return true;
else return false;
}
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