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Problem D: 寻找子矩阵

Memory Limit：128 MB Time Limit：1.000 S
Judge Style：Text Compare Creator：
Submit：36 Solved：5
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Description

Sample Input Copy 

3 4 2 3
1 5 2 3
2 3 4 2
8 2 4 3

Sample Output Copy 

13

HINT

第1种解法：https://www.bilibili.com/video/BV1w14y1U7oy/?spm_id_from=333.337.search-card.all.click&vd_source=ed609f9463861996afb742d2bd8b5a46
第2种解法：https://www.bilibili.com/video/BV11z4y1e7Pw/?spm_id_from=333.337.search-card.all.click&vd_source=ed609f9463861996afb742d2bd8b5a46

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