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Language:
滑雪
Time Limit: 1000MSMemory Limit: 65536K
Total Submissions: 120985Accepted: 46275

Description

Michael喜歡滑雪百這并不奇怪, 因為滑雪的確很刺激??墒菫榱双@得速度,滑的區域必須向下傾斜,而且當你滑到坡底,你不得不再次走上坡或者等待升降機來載你。Michael想知道載一個區域中最長底滑坡。區域由一個二維數組給出。數組的每個數字代表點的高度。下面是一個例子
 1  2  3  4 5

16 17 18 19 6
15 24 25 20 7
14 23 22 21 8
13 12 11 10 9

一個人可以從某個點滑向上下左右相鄰四個點之一,當且僅當高度減小。在上面的例子中,一條可滑行的滑坡為24-17-16-1。當然25-24-23-...-3-2-1更長。事實上,這是最長的一條。

Input

輸入的第一行表示區域的行數R和列數C(1 <= R,C <= 100)。下面是R行,每行有C個整數,代表高度h,0<=h<=10000。

Output

輸出最長區域的長度。

Sample Input

5 5
1 2 3 4 5
16 17 18 19 6
15 24 25 20 7
14 23 22 21 8
13 12 11 10 9

Sample Output

25

Source

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