Buggy python submission (verdict: Runtime Error):
import sys
import numpy as np

def main():
    MOD = int(1e9 + 7)

    n, k = map(int, input().split())
    can = np.zeros((n,n), dtype=int)
    for i in range(n):
        for j, e in enumerate(int(c) for c in input().split()):
            can[i,j] = e

    answer = np.eye(n, dtype=int)
    while k:
        if k % 2:
            answer = np.matmul(answer, can) % MOD
        can = np.matmul(can, can) % MOD
        k //= 2

    total = 0
    for i in range(n):
        for j in range(n):
            total += answer[i,j]
            if total >= MOD:
                total -= MOD

    print(total)


if __name__ == "__main__":
    main()


Fixed submission:
import sys
import numpy as np


def main():
    MOD = int(1e9 + 7)

    n, k = map(int, input().split())
    can = [[int(c) for c in input().split()] for _ in range(n)]
    can = np.matrix(can, 'O')
    
    # for i in range(n):
    #     for j, e in enumerate(int(c) for c in input().split()):
    #         can[i, j] = e

    b = np.eye(n, n, 0, 'O')
    while k:
        b = [b, b*can % MOD][k & 1]
        can = can*can % MOD
        k >>= 1

    print(b.sum() % MOD)

    # answer = np.eye(n, dtype=int)
    # while k:
    #     if k % 2:
    #         answer = np.dot(answer, can) % MOD
    #     can = np.dot(can, can) % MOD
    #     k //= 2

    # total = 0
    # for i in range(n):
    #     for j in range(n):
    #         total += answer[i,j]
    #         if total >= MOD:
    #             total -= MOD

    # print(total)


if __name__ == "__main__":
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
import numpy as np

def main():
    MOD = int(1e9 + 7)

    n, k = map(int, input().split())
    can = np.zeros((n,n), dtype=object)
    for i in range(n):
        for j, e in enumerate(int(c) for c in input().split()):
            can[i,j] = e

    answer = np.identity(n, dtype=object)
    while k:
        if k % 2:
            answer = np.dot(answer, can)
        can = np.dot(can, can)
        k //= 2

    total = 0
    for i in range(n):
        for j in range(n):
            total += answer[i,j]
            if total >= MOD:
                total -= MOD

    print(total)


if __name__ == "__main__":
    main()


Fixed submission:
import sys
import numpy as np


def main():
    MOD = int(1e9 + 7)

    n, k = map(int, input().split())
    can = [[int(c) for c in input().split()] for _ in range(n)]
    can = np.matrix(can, 'O')
    
    # for i in range(n):
    #     for j, e in enumerate(int(c) for c in input().split()):
    #         can[i, j] = e

    b = np.eye(n, n, 0, 'O')
    while k:
        b = [b, b*can % MOD][k & 1]
        can = can*can % MOD
        k >>= 1

    print(b.sum() % MOD)

    # answer = np.eye(n, dtype=int)
    # while k:
    #     if k % 2:
    #         answer = np.dot(answer, can) % MOD
    #     can = np.dot(can, can) % MOD
    #     k //= 2

    # total = 0
    # for i in range(n):
    #     for j in range(n):
    #         total += answer[i,j]
    #         if total >= MOD:
    #             total -= MOD

    # print(total)


if __name__ == "__main__":
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
import numpy as np

def main():
    MOD = int(1e9 + 7)

    n, k = map(int, input().split())
    can = np.zeros((n,n), dtype=object)
    for i in range(n):
        for j, e in enumerate(int(c) for c in input().split()):
            can[i,j] = e

    answer = np.identity(n, dtype=object)
    while k:
        if k % 2:
            answer = np.dot(answer, can)
        can = np.dot(can, can)
        k //= 2

    total = 0
    for i in range(n):
        for j in range(n):
            total += int(answer[i,j])
            if total >= MOD:
                total -= MOD

    print(total)


if __name__ == "__main__":
    main()


Fixed submission:
import sys
import numpy as np


def main():
    MOD = int(1e9 + 7)

    n, k = map(int, input().split())
    can = [[int(c) for c in input().split()] for _ in range(n)]
    can = np.matrix(can, 'O')
    
    # for i in range(n):
    #     for j, e in enumerate(int(c) for c in input().split()):
    #         can[i, j] = e

    b = np.eye(n, n, 0, 'O')
    while k:
        b = [b, b*can % MOD][k & 1]
        can = can*can % MOD
        k >>= 1

    print(b.sum() % MOD)

    # answer = np.eye(n, dtype=int)
    # while k:
    #     if k % 2:
    #         answer = np.dot(answer, can) % MOD
    #     can = np.dot(can, can) % MOD
    #     k //= 2

    # total = 0
    # for i in range(n):
    #     for j in range(n):
    #         total += answer[i,j]
    #         if total >= MOD:
    #             total -= MOD

    # print(total)


if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
import sys
import numpy as np

def main():
    MOD = int(1e9 + 7)

    n, k = map(int, input().split())
    can = np.zeros((n,n))
    for i in range(n):
        for j, e in enumerate(int(c) for c in input().split()):
            can[i,j] = e

    answer = np.identity(n)
    while k:
        if k % 2:
            answer = np.dot(answer, can)
        can = np.dot(can, can)
        k //= 2

    total = 0
    for i in range(n):
        for j in range(n):
            total += int(answer[i,j])
            if total >= MOD:
                total -= MOD

    print(total)


if __name__ == "__main__":
    main()


Fixed submission:
import sys
import numpy as np


def main():
    MOD = int(1e9 + 7)

    n, k = map(int, input().split())
    can = [[int(c) for c in input().split()] for _ in range(n)]
    can = np.matrix(can, 'O')
    
    # for i in range(n):
    #     for j, e in enumerate(int(c) for c in input().split()):
    #         can[i, j] = e

    b = np.eye(n, n, 0, 'O')
    while k:
        b = [b, b*can % MOD][k & 1]
        can = can*can % MOD
        k >>= 1

    print(b.sum() % MOD)

    # answer = np.eye(n, dtype=int)
    # while k:
    #     if k % 2:
    #         answer = np.dot(answer, can) % MOD
    #     can = np.dot(can, can) % MOD
    #     k //= 2

    # total = 0
    # for i in range(n):
    #     for j in range(n):
    #         total += answer[i,j]
    #         if total >= MOD:
    #             total -= MOD

    # print(total)


if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
import sys
import numpy as np

def main():
    MOD = int(1e9 + 7)

    n, k = map(int, input().split())
    can = np.zeros((n,n), dtype=np.int)
    for i in range(n):
        for j, e in enumerate(int(c) for c in input().split()):
            can[i,j] = e

    answer = np.identity(n, dtype=np.int)
    while k:
        if k % 2:
            answer = answer @ can
        can = can @ can
        k //= 2

    total = 0
    for i in range(n):
        for j in range(n):
            total += answer[i,j]
            if total >= MOD:
                total -= MOD

    print(total)


if __name__ == "__main__":
    main()


Fixed submission:
import sys
import numpy as np


def main():
    MOD = int(1e9 + 7)

    n, k = map(int, input().split())
    can = [[int(c) for c in input().split()] for _ in range(n)]
    can = np.matrix(can, 'O')
    
    # for i in range(n):
    #     for j, e in enumerate(int(c) for c in input().split()):
    #         can[i, j] = e

    b = np.eye(n, n, 0, 'O')
    while k:
        b = [b, b*can % MOD][k & 1]
        can = can*can % MOD
        k >>= 1

    print(b.sum() % MOD)

    # answer = np.eye(n, dtype=int)
    # while k:
    #     if k % 2:
    #         answer = np.dot(answer, can) % MOD
    #     can = np.dot(can, can) % MOD
    #     k //= 2

    # total = 0
    # for i in range(n):
    #     for j in range(n):
    #         total += answer[i,j]
    #         if total >= MOD:
    #             total -= MOD

    # print(total)


if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
import sys
import numpy as np

def main():
    MOD = int(1e9 + 7)

    n, k = map(int, input().split())
    can = np.zeros((n,n), dtype=np.int)
    for i in range(n):
        for j, e in enumerate(int(c) for c in input().split()):
            can[i,j] = e

    answer = np.identity(n, dtype=np.int)
    while k:
        if k % 2:
            answer = answer @ can
        can = can @ can
        k //= 2

    total = 0
    for i in range(n):
        for j in range(n):
            total += answer[i,j]
            if total >= MOD:
                total -= MOD

    print(total)


if __name__ == "__main__":
    main()


Fixed submission:
import sys
import numpy as np


def main():
    MOD = int(1e9 + 7)

    n, k = map(int, input().split())
    can = [[int(c) for c in input().split()] for _ in range(n)]
    can = np.matrix(can, 'O')
    
    # for i in range(n):
    #     for j, e in enumerate(int(c) for c in input().split()):
    #         can[i, j] = e

    b = np.eye(n, n, 0, 'O')
    while k:
        b = [b, b*can % MOD][k & 1]
        can = can*can % MOD
        k >>= 1

    print(b.sum() % MOD)

    # answer = np.eye(n, dtype=int)
    # while k:
    #     if k % 2:
    #         answer = np.dot(answer, can) % MOD
    #     can = np.dot(can, can) % MOD
    #     k //= 2

    # total = 0
    # for i in range(n):
    #     for j in range(n):
    #         total += answer[i,j]
    #         if total >= MOD:
    #             total -= MOD

    # print(total)


if __name__ == "__main__":
    main()