CF1487G.String Counting
普及/提高-
通过率:0%
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题目描述
You have c1 letters 'a', c2 letters 'b', ..., c26 letters 'z'. You want to build a beautiful string of length n from them (obviously, you cannot use the i -th letter more than ci times). Each ci is greater than 3n .
A string is called beautiful if there are no palindromic contiguous substrings of odd length greater than 1 in it. For example, the string "abacaba" is not beautiful, it has several palindromic substrings of odd length greater than 1 (for example, "aca"). Another example: the string "abcaa" is beautiful.
Calculate the number of different strings you can build, and print the answer modulo 998244353 .
输入格式
The first line contains one integer n ( 3≤n≤400 ).
The second line contains 26 integers c1 , c2 , ..., c26 ( 3n<ci≤n ).
输出格式
Print one integer — the number of strings you can build, taken modulo 998244353 .
输入输出样例
输入#1
4 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
输出#1
422500
输入#2
3 2 2 2 2 2 2 3 3 3 2 2 2 2 2 2 3 3 3 2 2 3 2 2 3 2 2
输出#2
16900
输入#3
400 348 322 247 158 209 134 151 267 268 176 214 379 372 291 388 135 147 304 169 149 193 351 380 368 181 340
输出#3
287489790