웅크리기
Time Limit: 1 SecMemory Limit: 128 MiB
Example Input 1
3 1
2 1
3 3
-1 2
Example Output 1
NO
Example Input 2
4 1
2 2
3 3
-2 -1
2 -5
Example Output 2
YES
Example Input 3
2 1
5 5
5 5
Example Output 3
NO
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