Buggy python submission (verdict: Time Limit Exceeded):
import sys
import numpy as np
def input(): return sys.stdin.readline().rstrip()


def main():
    h, w = map(int, input().split())
    A = np.array([list(map(int, input().split()))
                  for i in range(h)], dtype=int)
    B = np.array([list(map(int, input().split()))
                  for i in range(h)], dtype=int)
    abss = np.abs(A-B)
    kmax = 280
    dp = np.zeros((h, w, kmax), dtype=int)
    dp[0][0][abss[0][0]] = 1
    for i in range(h):
        for j in range(w):
            for k in range(kmax):
                if dp[i][j][k] == 1:
                    if i != h-1:
                        dp[i+1][j][abs(k-abss[i+1][j])] = 1
                        if k+abss[i+1][j] < kmax:
                            dp[i+1][j][k+abss[i+1][j]] = 1
                    if j != w-1:
                        dp[i][j+1][abs(k-abss[i][j+1])] = 1
                        if k+abss[i][j+1] < kmax:
                            dp[i][j+1][k+abss[i][j+1]] = 1
    for k in range(kmax):
        if dp[-1][-1][k] == 1:
            print(k)
            break


if __name__ == '__main__':
    main()

Fixed submission:
import sys
def input(): return sys.stdin.readline().rstrip()


def main():
    h, w = map(int, input().split())
    A = [list(map(int, input().split()))for i in range(h)]
    B = [list(map(int, input().split()))for i in range(h)]
    abss = [[abs(A[i][j]-B[i][j])for j in range(w)] for i in range(h)]
    kmax = 6400
    dp = [[[0]*kmax for j in range(w)]for i in range(h)]
    dp[0][0][abss[0][0]] = 1
    for i in range(h):
        for j in range(w):
            for k in range(kmax):
                if dp[i][j][k] == 1:
                    if i != h-1:
                        dp[i+1][j][abs(k-abss[i+1][j])] = 1
                        if k+abss[i+1][j] < kmax:
                            dp[i+1][j][k+abss[i+1][j]] = 1
                    if j != w-1:
                        dp[i][j+1][abs(k-abss[i][j+1])] = 1
                        if k+abss[i][j+1] < kmax:
                            dp[i][j+1][k+abss[i][j+1]] = 1
    for k in range(kmax):
        if dp[-1][-1][k] == 1:
            print(k)
            break


if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
import numpy as np
def input(): return sys.stdin.readline().rstrip()


def main():
    h, w = map(int, input().split())
    A = np.array([list(map(int, input().split()))
                  for i in range(h)], dtype=int)
    B = np.array([list(map(int, input().split()))
                  for i in range(h)], dtype=int)
    abss = np.abs(A-B)
    kmax = 400
    dp = np.zeros((h, w, kmax), dtype=int)
    dp[0][0][abss[0][0]] = 1
    for i in range(h):
        for j in range(w):
            for k in range(kmax):
                if dp[i][j][k] == 1:
                    if i != h-1:
                        dp[i+1][j][abs(k-abss[i+1][j])] = 1
                        if k+abss[i+1][j] < kmax:
                            dp[i+1][j][k+abss[i+1][j]] = 1
                    if j != w-1:
                        dp[i][j+1][abs(k-abss[i][j+1])] = 1
                        if k+abss[i][j+1] < kmax:
                            dp[i][j+1][k+abss[i][j+1]] = 1
    for k in range(kmax):
        if dp[-1][-1][k] == 1:
            print(k)
            break


if __name__ == '__main__':
    main()


Fixed submission:
import sys
def input(): return sys.stdin.readline().rstrip()


def main():
    h, w = map(int, input().split())
    A = [list(map(int, input().split()))for i in range(h)]
    B = [list(map(int, input().split()))for i in range(h)]
    abss = [[abs(A[i][j]-B[i][j])for j in range(w)] for i in range(h)]
    kmax = 6400
    dp = [[[0]*kmax for j in range(w)]for i in range(h)]
    dp[0][0][abss[0][0]] = 1
    for i in range(h):
        for j in range(w):
            for k in range(kmax):
                if dp[i][j][k] == 1:
                    if i != h-1:
                        dp[i+1][j][abs(k-abss[i+1][j])] = 1
                        if k+abss[i+1][j] < kmax:
                            dp[i+1][j][k+abss[i+1][j]] = 1
                    if j != w-1:
                        dp[i][j+1][abs(k-abss[i][j+1])] = 1
                        if k+abss[i][j+1] < kmax:
                            dp[i][j+1][k+abss[i][j+1]] = 1
    for k in range(kmax):
        if dp[-1][-1][k] == 1:
            print(k)
            break


if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
import numpy as np
def input(): return sys.stdin.readline().rstrip()


def main():
    h, w = map(int, input().split())
    A = np.array([list(map(int, input().split()))
                  for i in range(h)], dtype=int)
    B = np.array([list(map(int, input().split()))
                  for i in range(h)], dtype=int)
    abss = np.abs(A-B)
    dp = np.zeros((h, w, 800), dtype=int)
    kmax = 800
    dp[0][0][abss[0][0]] = 1
    for i in range(h):
        for j in range(w):
            for k in range(kmax):
                if dp[i][j][k] == 1:
                    if i != h-1:
                        dp[i+1][j][abs(k-abss[i+1][j])] = 1
                        if k+abss[i+1][j] < kmax:
                            dp[i+1][j][k+abss[i+1][j]] = 1
                    if j != w-1:
                        dp[i][j+1][abs(k-abss[i][j+1])] = 1
                        if k+abss[i][j+1] < kmax:
                            dp[i][j+1][k+abss[i][j+1]] = 1
    for k in range(kmax):
        if dp[-1][-1][k] == 1:
            print(k)
            break


if __name__ == '__main__':
    main()

Fixed submission:
import sys
def input(): return sys.stdin.readline().rstrip()


def main():
    h, w = map(int, input().split())
    A = [list(map(int, input().split()))for i in range(h)]
    B = [list(map(int, input().split()))for i in range(h)]
    abss = [[abs(A[i][j]-B[i][j])for j in range(w)] for i in range(h)]
    kmax = 6400
    dp = [[[0]*kmax for j in range(w)]for i in range(h)]
    dp[0][0][abss[0][0]] = 1
    for i in range(h):
        for j in range(w):
            for k in range(kmax):
                if dp[i][j][k] == 1:
                    if i != h-1:
                        dp[i+1][j][abs(k-abss[i+1][j])] = 1
                        if k+abss[i+1][j] < kmax:
                            dp[i+1][j][k+abss[i+1][j]] = 1
                    if j != w-1:
                        dp[i][j+1][abs(k-abss[i][j+1])] = 1
                        if k+abss[i][j+1] < kmax:
                            dp[i][j+1][k+abss[i][j+1]] = 1
    for k in range(kmax):
        if dp[-1][-1][k] == 1:
            print(k)
            break


if __name__ == '__main__':
    main()