Problem2853--【CSP-S2020】P2 - 动物园

2853: 【CSP-S2020】P2 - 动物园

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Time Limit : 1.000 sec  Memory Limit : 128 MB

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Description




Sample Input Copy 

3 3 5 4
1 4 6
0 3
2 4
2 5

Sample Output Copy 

13

Source/Category

CSP-S 
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