Submission #1205538

#	Time	Username	Problem	Language	Result	Execution time	Memory
1205538		ofoz	Red-blue table (IZhO19_stones)	Pypy 3	11 / 100	208 ms	63400 KiB

stones

from collections import deque
from sys import setrecursionlimit

def solveOdd(n: int, m: int):
    grid = [[1] * m for _ in range(n)]
    for i in range(n-1, n):
        for j in range(m):
            grid[i][j] = 0
    
    for i in range(n-1):
        for j in range(m-1):
            if (i + j) & 1: grid[i][j] = 1
            else: grid[i][j] = 0

    if m <= 2:
        grid = [[1] * m for _ in range(n)]
        print(n)
    elif n <= 2:
        grid = [[0] * m for _ in range(n)]
        print(m)
    else:
        print(n + m - 2)
    for i, row in enumerate(grid):
        for c in row:
            print(("-" if not c else "+"), end = "")
        print()

def solveEven(n: int, m: int):
    grid = [[1] * m for _ in range(n)]
    for i in range(n-1, n):
        for j in range(m):
            grid[i][j] = 0
    d = n//2
    for i in range(n-1):
        for j in range(m-2):
            mod = (j) % d
            if mod < d//2: grid[i][j] = 1 if i % 2 == 0 else 0
            else: grid[i][j] = 0 if i % 2 == 0 else 1
    
    if m <= 3:
        grid = [[1] * m for _ in range(n)]
        print(n)
    elif n <= 3:
        grid = [[0] * m for _ in range(n)]
        print(m)
    else:
        print(n + m - 3)
    for i, row in enumerate(grid):
        for c in row:
            print(("-" if not c else "+"), end = "")
        print()

def solve():
    n, m = map(int, input().split(" "))
    if n & 1: solveOdd(n, m)
    else: solveEven(n, m)
    


    


    



"""
4 4
- + + +
+ - + +
- + + +
- - - -

6 6
- - + + + +
+ + - - + +
- - + + + +
+ + - - + +
- - + + + +
- - - - - -
M + N - 3
"""




for _ in range(int(input())): solve()

Compilation message (stdout)

Compiling 'stones.py'...

=======
  adding: __main__.pyc (deflated 59%)

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• Subtask 1: 0 / 17
• Subtask 2: 0 / 10
• Subtask 3: 0 / 16
• Subtask 4: 11 / 11
• Subtask 5: 0 / 15
• Subtask 6: 0 / 31