String:657. Judge Route Circle

这个题倒是很简单，没什么可说的：

class Solution {public:    bool judgeCircle(string moves) {        int x = 0;        int y = 0;        for(int i = 0; i < moves.size(); ++i)        {            if(moves[i] == 'U')                y++;            else if(moves[i] == 'D')                y--;            else if(moves[i] == 'L')                x--;            else if(moves[i] == 'R')                x++;        }        if(x == 0 && y == 0)            return true;        else            return false;    }};