A13989. 1 2 3 4 ...
编程题
普及/提高-
知识点
题目描述
Igor had a sequence $d_1, d_2, \dots, d_n$ of integers. When Igor entered the classroom there was an integer $x$ written on the blackboard.
Igor generated sequence $p$ using the following algorithm:
1. initially, $p = [x]$ ;
2. for each $1 \leq i \leq n$ he did the following operation $|d_i|$ times:
- if $d_i \geq 0$ , then he looked at the last element of $p$ (let it be $y$ ) and appended $y + 1$ to the end of $p$ ;
- if $d_i < 0$ , then he looked at the last element of $p$ (let it be $y$ ) and appended $y - 1$ to the end of $p$ .
For example, if $x = 3$ , and $d = [1, -1, 2]$ , $p$ will be equal $[3, 4, 3, 4, 5]$ .
Igor decided to calculate the length of the longest increasing subsequence of $p$ and the number of them.
A sequence $a$ is a subsequence of a sequence $b$ if $a$ can be obtained from $b$ by deletion of several (possibly, zero or all) elements.
A sequence $a$ is an increasing sequence if each element of $a$ (except the first one) is strictly greater than the previous element.
For $p = [3, 4, 3, 4, 5]$ , the length of longest increasing subsequence is $3$ and there are $3$ of them: $[\underline{3}, \underline{4}, 3, 4, \underline{5}]$ , $[\underline{3}, 4, 3, \underline{4}, \underline{5}]$ , $[3, 4, \underline{3}, \underline{4}, \underline{5}]$ .
Igor generated sequence $p$ using the following algorithm:
1. initially, $p = [x]$ ;
2. for each $1 \leq i \leq n$ he did the following operation $|d_i|$ times:
- if $d_i \geq 0$ , then he looked at the last element of $p$ (let it be $y$ ) and appended $y + 1$ to the end of $p$ ;
- if $d_i < 0$ , then he looked at the last element of $p$ (let it be $y$ ) and appended $y - 1$ to the end of $p$ .
For example, if $x = 3$ , and $d = [1, -1, 2]$ , $p$ will be equal $[3, 4, 3, 4, 5]$ .
Igor decided to calculate the length of the longest increasing subsequence of $p$ and the number of them.
A sequence $a$ is a subsequence of a sequence $b$ if $a$ can be obtained from $b$ by deletion of several (possibly, zero or all) elements.
A sequence $a$ is an increasing sequence if each element of $a$ (except the first one) is strictly greater than the previous element.
For $p = [3, 4, 3, 4, 5]$ , the length of longest increasing subsequence is $3$ and there are $3$ of them: $[\underline{3}, \underline{4}, 3, 4, \underline{5}]$ , $[\underline{3}, 4, 3, \underline{4}, \underline{5}]$ , $[3, 4, \underline{3}, \underline{4}, \underline{5}]$ .
输入格式
The first line contains a single integer $n$ ( $1 \leq n \leq 50$ ) — the length of the sequence $d$ .
The second line contains a single integer $x$ ( $-10^9 \leq x \leq 10^9$ ) — the integer on the blackboard.
The third line contains $n$ integers $d_1, d_2, \ldots, d_n$ ( $-10^9 \leq d_i \leq 10^9$ ).
The second line contains a single integer $x$ ( $-10^9 \leq x \leq 10^9$ ) — the integer on the blackboard.
The third line contains $n$ integers $d_1, d_2, \ldots, d_n$ ( $-10^9 \leq d_i \leq 10^9$ ).
输出格式
Print two integers:
- the first integer should be equal to the length of the longest increasing subsequence of $p$ ;
- the second should be equal to the number of them modulo $998244353$ .
You should print only the second number modulo $998244353$ .
- the first integer should be equal to the length of the longest increasing subsequence of $p$ ;
- the second should be equal to the number of them modulo $998244353$ .
You should print only the second number modulo $998244353$ .
输入输出样例
输入 #1
3 3 1 -1 2
输出 #1
3 3
输入 #2
3 100 5 -3 6
输出 #2
9 7
输入 #3
3 1 999999999 0 1000000000
输出 #3
2000000000 1
输入 #4
5 34 1337 -146 42 -69 228
输出 #4
1393 3876
说明/提示
The first test case was explained in the statement.
In the second test case $p = [100, 101, 102, 103, 104, 105, 104, 103, 102, 103, 104, 105, 106, 107, 108]$ .
In the third test case $p = [1, 2, \ldots, 2000000000]$ .
In the second test case $p = [100, 101, 102, 103, 104, 105, 104, 103, 102, 103, 104, 105, 106, 107, 108]$ .
In the third test case $p = [1, 2, \ldots, 2000000000]$ .