479. Robot Return to Origin
EasySimulation
A robot starts at (0, 0) and follows moves U, D, L, R. Print YES if it ends at the origin, else NO.
Input format
One string of moves
Output format
YES or NO
Example 1
Input
UD
Output
YES
Example 2
Input
LL
Output
NO
Constraints
1 ≤ |moves| ≤ 2 × 10⁴
Read input from standard input and print the answer to standard output. Your code is judged against 4 test cases, most of them hidden.
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