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
Solution:
bool judgeCircle(std::string moves) { int v = 0, h = 0; for (char c : moves) { switch (c) { case 'U': v++; break; case 'D': v--; break; case 'R': h++; break; case 'L': h--; break; } } if (v == 0 && h == 0) return true; else return false; }