Grid Paths II

def main():
    n, m = [int(x) for x in input().split()]
    x = [[0 for i in range(10)] for j in range(n)]
    x[0][:] = 1
    x[:][0] = 1
    for _ in range(m):
        a, b = [int(x) for x in input().split()]
        x[a-1][b-1] = None

    for s in range(1, n):
        for j in range(s, n):
            if x[s][j] is not None:
                x[s][j] = x[s][j-1] + x[s-1][j]


    print(x[n-1][n-1] % (10**9 + 7))

main()


    # def calculateCurrent(x, y):
    #     if x == y == 0:
    #         return 1
    #     elif x == -1 or y == -1:
    #         return 0
    #     elif [x, y] in trap:
    #         return 0
    #     else:
    #         return calculateCurrent(x-1, y) + calculateCurrent(x, y-1)

Test 1

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 21, in <module>
    main()...

Test 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 21, in <module>
    main()...

Test 3

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 21, in <module>
    main()...

Test 4

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 21, in <module>
    main()...

Test 5

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 21, in <module>
    main()...

Test 6

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 21, in <module>
    main()...

Test 7

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 21, in <module>
    main()...

Test 8

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 21, in <module>
    main()...

Test 9

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 21, in <module>
    main()...

Test 10

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 21, in <module>
    main()...