题目
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代码
用图形思维考虑代码
class Solution {public boolean judgeCircle(String moves) {int x=0,y=0;int len = moves.length();for(char temp : moves.toCharArray()){switch(temp){case 'U':y++;break;case 'D':y--;break;case 'R':x++;break;case 'L':x--;break;}}return x==0&&y==0;}
}