Problem3617--【Div3】abc459c-Drop Blocks

3617: 【Div3】abc459c-Drop Blocks

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Time Limit : 2.000 sec  Memory Limit : 128 MB

SubmitSolved: 4Submit Num: 5Statistics

Description



Input

Sample Input Copy 

3 7
1 1
1 3
1 3
2 1
2 2
1 2
2 1

Sample Output Copy 

2
1
1

HINT

Source/Category

atcoder 逆向思维 
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