Problem3422--【Div3】abc408c - Not All Covered

3422: 【Div3】abc408c - Not All Covered

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Time Limit : 1.000 sec  Memory Limit : 128 MB

SubmitSolved: 6Submit Num: 7Statistics

Description

Sample Input Copy 

10 4
1 6
4 5
5 10
7 10

Sample Output Copy 

1

Source/Category

Div3 数据结构 差分 区间 
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