[leetcode-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 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
思路:
思路比较简单,就是用x记录x方向位置,y记录y方向位置。最后如果还在原点的话说明有circle。
bool judgeCircle(string moves) { int x=0,y=0; for(auto c:moves) { if(c == ‘U‘)y++; if(c == ‘D‘)y--; if(c == ‘L‘)x--; if(c == ‘R‘)x++; } if(x==0&&y==0)return true; return false; }
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