useful matrix functions for the exam

# USEFULL MATRIX FUNCTIONS FOR THE EXAM -> SAVING TIME !
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# Validating if cell is inside the matrix :
# SIZE_N = SIZE_M (SQUARED MATRIX) 3x3 , 4x4 , 5x5 etc...
def is_inside(row, col):
    return 0 <= row < SIZE and 0 <= col < SIZE

# IF CELL IS OUTSIDE! : # not recommendable !
def is_outside(row,col):
    return if row < 0 or row > SIZE - 1 or col < 0 or col > SIZE - 1


# If matrix not squared: 4x6 , 3x5 , 12x8 etc...
N = size_rows
M = size_cols
def is_inside(r, c):
    return 0 <= row < N and 0 <= col < M
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# Get next position/step/move : ( 1 step )
def get_next_position(direction, row, col):
    if direction == 'left':
        return row, col - 1
    elif direction == 'right':
        return row, col + 1
    elif direction == 'up':
        return row - 1, col
    elif direction == 'down':
        return row + 1, col
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#Validate if STEP -> After geting the current position and if is OUTSIDE the matrix -> continue to the other side with the same direction :
def validate_step(row, col):
    if row >= SIZE:
        row = 0
    elif row < 0:
        row = (SIZE - 1)

    if col >= SIZE:
        col = 0
    elif col < 0:
        col = (SIZE - 1)
    return row, col

# OR module divide '%' -> automaticly returns you if the current step goes OUTSIDE \
# and returns you a valid indexes on the other side of the matrix with the same direction .
def get_next_position(direction, row, col):
    if direction == 'left':
        return row % SIZE, (col - 1)% SIZE
    elif direction == 'right':
        return row % SIZE, (col + 1)% SIZE
    elif direction == 'up':
        return (row - 1)% SIZE, col % SIZE
    elif direction == 'down':
        return (row + 1)%SIZE, col % SIZE
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# All tuple-indexes in a single LIST wich surrounding a cell :
#                                          |            DIAGONALS :
#         right    left      Up      down  |r-down, right-up, left-up, left-down
moves = [(0, 1), (0, -1), (-1, 0), (1, 0), (1, 1), (-1, 1), (-1, -1), (1, -1)]

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