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Limite de temps : 3 s Limite de mémoire : 512 MB Points totaux : 100

#415. 王的象棋世界

Statistiques

有一個 $R\times C$ 的棋盤,你有 $Q$ 組詢問,每次詢問國王走 $R-1$ 步從 $(1,a)$ 到達 $(R,b)$ 有多少種方案。你只需要輸出答案對 $998244353$ 取模的結果。

輸入格式

第一行輸入三個正整數 $R, C, Q$,表示棋盤的長寬以及詢問次數。

接下來 $Q$ 行每行兩個正整數 $a,b$,表示一組具體詢問。

輸出格式

輸出 $Q$ 行每行一個整數,表示對應詢問的方案數。

範例

範例 1 輸入

13 10 10
10 1
2 2
9 1
10 5
8 8
9 1
9 3
7 5
5 6
8 10

範例 1 輸出

328
45475
1142
12804
65715
1142
7995
58199
69552
29964

子任務

對於 $100\%$ 的資料,保證 $2\le C\le 10^5, C\le R\le 10^9, 1\le Q\le 10^5$。

子任務編號 $C\le$ $Q\le $ 分值
$1$ $10^2$ $10^4$ $11$
$2$ $10^3$ $10$ $14$
$3$ $10^5$ $25$
$4$ $10^5$ $10^2$ $30$
$5$ $10^5$ $20$

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