Problem Statement

Given is a string S consisting of lowercase English letters. Determine whether adding some number of a's (possibly zero) at the beginning of S can make it a palindrome.

Here, a string of length N, A=A_1A_2\ldots A_N, is said to be a palindrome when A_i=A_{N+1-i} for every 1\leq i\leq N.

Constraints

• 1 \leq \lvert S \rvert \leq 10^6
• S consists of lowercase English letters.

Sample Input 1

kasaka

Sample Output 1

Yes

By adding one a at the beginning of kasaka, we have akasaka, which is a palindrome, so Yes should be printed.

Sample Input 2

atcoder

Sample Output 2

No

Adding any number of a's at the beginning of atcoder does not make it a palindrome.

Sample Input 3

php

Sample Output 3

Yes

php itself is a palindrome. Adding zero a's at the beginning of S is allowed, so Yes should be printed.

Problem Statement

This problem is an easier version of Problem G.

There is a slot machine with three reels.
The arrangement of symbols on the i-th reel is represented by the string S_i. Here, S_i is a string of length M consisting of digits.

Each reel has a corresponding button. For each non-negative integer t, Takahashi can either choose and press one button or do nothing exactly t seconds after the reels start spinning.
If he presses the button corresponding to the i-th reel exactly t seconds after the reels start spinning, the i-th reel will stop and display the ((t \bmod M)+1)-th character of S_i.
Here, t \bmod M denotes the remainder when t is divided by M.

Takahashi wants to stop all the reels so that all the displayed characters are the same.
Find the minimum possible number of seconds from the start of the spin until all the reels are stopped so that his goal is achieved.
If this is impossible, report that fact.

Constraints

• 1 \leq M \leq 100
• M is an integer.
• S_i is a string of length M consisting of digits.

Sample Input 1

10
1937458062
8124690357
2385760149

Sample Output 1

6

Takahashi can stop each reel as follows so that 6 seconds after the reels start spinning, all the reels display 8.

• Press the button corresponding to the second reel 0 seconds after the reels start spinning. The second reel stops and displays 8, the ((0 \bmod 10)+1=1)-st character of S_2.
• Press the button corresponding to the third reel 2 seconds after the reels start spinning. The third reel stops and displays 8, the ((2 \bmod 10)+1=3)-rd character of S_3.
• Press the button corresponding to the first reel 6 seconds after the reels start spinning. The first reel stops and displays 8, the ((6 \bmod 10)+1=7)-th character of S_1.

There is no way to make the reels display the same character in 5 or fewer seconds, so print 6.

Sample Input 2

20
01234567890123456789
01234567890123456789
01234567890123456789

Sample Output 2

20

Note that he must stop all the reels and make them display the same character.

Sample Input 3

5
11111
22222
33333

Sample Output 3

-1

It is impossible to stop the reels so that all the displayed characters are the same.
In this case, print -1.

Problem Statement

There are N trampolines on a two-dimensional planar town where Takahashi lives. The i-th trampoline is located at the point (x_i, y_i) and has a power of P_i. Takahashi's jumping ability is denoted by S. Initially, S=0. Every time Takahashi trains, S increases by 1.

Takahashi can jump from the i-th to the j-th trampoline if and only if:

• P_iS\geq |x_i - x_j| +|y_i - y_j|.

Takahashi's objective is to become able to choose a starting trampoline such that he can reach any trampoline from the chosen one with some jumps.

At least how many times does he need to train to achieve his objective?

Constraints

• 2 \leq N \leq 200
• -10^9 \leq x_i,y_i \leq 10^9
• 1 \leq P_i \leq 10^9
• (x_i, y_i) \neq (x_j,y_j)\ (i\neq j)
• All values in input are integers.

Sample Input 1

4
-10 0 1
0 0 5
10 0 1
11 0 1

Sample Output 1

2

If he trains twice, S=2, in which case he can reach any trampoline from the 2-nd one.

For example, he can reach the 4-th trampoline as follows.

• Jump from the 2-nd to the 3-rd trampoline. (Since P_2 S = 10 and |x_2-x_3| + |y_2-y_3| = 10, it holds that P_2 S \geq |x_2-x_3| + |y_2-y_3|.)

• Jump from the 3-rd to the 4-th trampoline. (Since P_3 S = 2 and |x_3-x_4| + |y_3-y_4| = 1, it holds that P_3 S \geq |x_3-x_4| + |y_3-y_4|.)

Sample Input 2

7
20 31 1
13 4 3
-10 -15 2
34 26 5
-2 39 4
0 -50 1
5 -20 2

Sample Output 2

18

Problem Statement

For a sequence X, let f(X) = (the minimum number of elements one must modify to make X a palindrome).

Given a sequence A of length N, find the sum of f(X) over all contiguous subarrays of A.

Here, a sequence X of length m is said to be a palindrome if and only if the i-th and the (m+1-i)-th elements of X are equal for all 1 \le i \le m.

Constraints

• All values in the input are integers.
• 1 \le N \le 2 \times 10^5
• 1 \le A_i \le N

Sample Input 1

5
5 2 1 2 2

Sample Output 1

9

• f(5) = 0
• f(2) = 0
• f(1) = 0
• f(2) = 0
• f(2) = 0
• f(5,2) = 1
• f(2,1) = 1
• f(1,2) = 1
• f(2,2) = 0
• f(5,2,1) = 1
• f(2,1,2) = 0
• f(1,2,2) = 1
• f(5,2,1,2) = 2
• f(2,1,2,2) = 1
• f(5,2,1,2,2) = 1

Therefore, the sought answer is 9.

Problem Statement

We have N dice. For each i = 1, 2, \ldots, N, when the i-th die is thrown, it shows a random integer between 1 and A_i, inclusive, with equal probability.

Find the probability, modulo 998244353, that the following condition is satisfied when the N dice are thrown simultaneously.

There is a way to choose some (possibly all) of the N dice so that the sum of their results is 10.

Constraints

• 1 \leq N \leq 100
• 1 \leq A_i \leq 10^6
• All input values are integers.

Sample Input 1

4
1 7 2 9

Sample Output 1

942786334

For instance, if the first, second, third, and fourth dice show 1, 3, 2, and 7, respectively, these results satisfy the condition. In fact, if the second and fourth dice are chosen, the sum of their results is 3 + 7 = 10. Alternatively, if the first, third, and fourth dice are chosen, the sum of their results is 1 + 2 + 7 = 10.

On the other hand, if the first, second, third, and fourth dice show 1, 6, 1, and 5, respectively, there is no way to choose some of them so that the sum of their results is 10, so the condition is not satisfied.

In this sample input, the probability of the results of the N dice satisfying the condition is \frac{11}{18}. Thus, print this value modulo 998244353, that is, 942786334.

Sample Input 2

7
1 10 100 1000 10000 100000 1000000

Sample Output 2

996117877