Inna and Choose Options (Codeforces 400A)
Tags: Implement, implementation

There always is something to choose from! And now, instead of "Noughts and Crosses", Inna choose a very unusual upgrade of this game. The rules of the game are given below:There is one person playing the game. Before the beginning of the game he puts 12 cards in a row on the table. Each card contains a character: "X" or "O". Then the player chooses two positive integers a and b (a·b = 12), after that he makes a table of size a × b from the cards he put on the table as follows: the first b cards form the first row of the table, the second b cards form the second row of the table and so on, the last b cards form the last (number a) row of the table. The player wins if some column of the table contain characters "X" on all cards. Otherwise, the player loses.Inna has already put 12 cards on the table in a row. But unfortunately, she doesn't know what numbers a and b to choose. Help her win the game: print to her all the possible ways of numbers a, b that she can choose and win.

Input: The first line of the input contains integer t (1 ≤ t ≤ 100). This value shows the number of sets of test data in the input. Next follows the description of each of the t tests on a separate line.The description of each test is a string consisting of 12 characters, each character is either "X", or "O". The i-th character of the string shows the character that is written on the i-th card from the start.

Output: For each test, print the answer to the test on a single line. The first number in the line must represent the number of distinct ways to choose the pair a, b. Next, print on this line the pairs in the format axb. Print the pairs in the order of increasing first parameter (a). Separate the pairs in the line by whitespaces.


Sample Inputs:
4
OXXXOXOOXOOX
OXOXOXOXOXOX
XXXXXXXXXXXX
OOOOOOOOOOOO

Sample Outputs:
3 1x12 2x6 4x3
4 1x12 2x6 3x4 6x2
6 1x12 2x6 3x4 4x3 6x2 12x1
0

Solution (Python):
n = int(input())
tests = []
answer = []
for i in range(n):
    x = input()
    tests.append(x)
for i in range(n):
    if 'X' in tests[i]:
        answer.append('1x12')
    for j in range(6):
        if tests[i][j] == tests[i][j + 6] == 'X':
            answer.append('2x6')
            break
    for j in range(4):
        if tests[i][j] == tests[i][j + 4] == tests[i][j + 8] == 'X':
            answer.append('3x4')
            break
    for j in range(3):
        if tests[i][j] == tests[i][j + 3] == tests[i][j + 6] == tests[i][j + 9] == 'X':
            answer.append('4x3')
            break
    for j in range(2):
        if tests[i][j] == tests[i][j + 2] == tests[i][j + 4] == tests[i][j + 6] == tests[i][j + 8] == tests[i][j + 10] == 'X':
            answer.append('6x2')
            break
    if tests[i] == 'XXXXXXXXXXXX':
        answer.append('12x1')
    ANSWER = [len(answer)]
    ANSWER.extend(answer)
    for J in range(len(ANSWER)):
        print(ANSWER[J], end=' ')
    print()
    answer = []

Solution (Python):
t = int(input())
for _ in range(t):
    cards = input()
    possible_pairs = []
    for a in range(1, 13):
        if 12 % a == 0:
            b = 12 // a
            valid = False
            for j in range(b):
                column = [cards[i] for i in range(j, 12, b)]
                if all((char == 'X' for char in column)):
                    valid = True
                    break
            if valid:
                possible_pairs.append(f'{a}x{b}')
    print(len(possible_pairs), ' '.join(possible_pairs))

Solution (Python):
t = int(input())
fot = [[1, 12], [2, 6], [3, 4], [4, 3], [6, 2], [12, 1]]

def ctm(arr, row, col):
    mat = [list(r) for r in zip(*[iter(arr)] * col)]
    return mat
for _ in range(t):
    arr = list(input())
    winmat = []
    for pair in fot:
        mat = ctm(arr, pair[0], pair[1])
        for j in range(len(mat[0])):
            allx = True
            for i in range(len(mat)):
                if mat[i][j] == 'O':
                    allx = False
            if allx:
                winmat.append(pair)
                break
    print(len(winmat), end=' ')
    for p in winmat:
        print(p[0], end='')
        print('x', end='')
        print(p[1], end=' ')
    print()