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Time Limit: 3 s Memory Limit: 512 MB Total points: 100

#415. 王的象棋世界

统计

一个 $R\times C$ 的棋盘,你有 $Q$ 组询问,每次询问国王走 $R-1$ 步从 $(1,a)$ 到达 $(R,b)$ 有多少种方案。你只需要输出答案对 $998244353$ 取模的结果。

输入格式

第一行输入三个正整数 $R, C, Q$,表示棋盘的长宽以及询问次数。

接下来 $Q$ 行每行两个正整数 $a,b$,表示一组具体询问。

输出格式

输出 $Q$ 行每行一个整数,表示对应询问的方案数。

样例数据

样例 1 输入

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

样例 1 输出

328
45475
1142
12804
65715
1142
7995
58199
69552
29964

子任务

对于 $100\%$ 的数据,保证 $2\le C\le 10^5, C\le R\le 10^9, 1\le Q\le 10^5$。

子任务编号 $C\le$ $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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