@cvp, thank you all for help!!!

With your function i receive right col for '-', but not for '+':

def uniques_col(operators, max):

n = 0

if operators == '+':

for i in range(1,max):

for j in range(i,max-i+1):

n += 1

print(i,operators,j,'=',i+j)

elif operators == '-':

for i in range(1,max+1):

for j in range(1,i+1):

n += 1

print(i,operators,j,'=',i-j)

return n

while True:

op = input('operator\n')

max = int(input('max\n'))

print(uniques_col(op,max))

What i receive:

operator-

max4

1 - 1 = 0

2 - 1 = 1

2 - 2 = 0

3 - 1 = 2

3 - 2 = 1

3 - 3 = 0

4 - 1 = 3

4 - 2 = 2

4 - 3 = 1

4 - 4 = 0

10

operator+

max4

1 + 1 = 2

1 + 2 = 3

1 + 3 = 4

2 + 2 = 4

4

Where is 1+3 and 2+1, so for '+' i need receive 6 unique examples.