Buggy python submission (verdict: Time Limit Exceeded):
def main():
    # import sys
    # readline = sys.stdin.readline
    # readlines = sys.stdin.readlines
    H, W = map(int, input().split())
    A = [list(map(int, input().split())) for _ in range(H)]
    B = [list(map(int, input().split())) for _ in range(H)]
    grid = [[0] * W for _ in range(H)]
    for i in range(H):
        for j in range(W):
            grid[i][j] = abs(A[i][j] - B[i][j])

    dp = [[set() for _ in range(W)] for _ in range(H)]
    dp[0][0].add(grid[0][0])

    for i in range(H):
        for j in range(W):
            for k in dp[i][j]:
                if i < H - 1:
                    nk = grid[i + 1][j]
                    dp[i + 1][j].add(k + nk)
                    dp[i + 1][j].add(abs(k - nk))
                if j < W - 1:
                    nk = grid[i][j + 1]
                    dp[i][j + 1].add(k + nk)
                    dp[i][j + 1].add(abs(k - nk))

    print(min(dp[-1][-1]))


if __name__ == "__main__":
    main()


Fixed submission:
H, W = map(int, input().split())

A = [list(map(int, input().split())) for _ in range(H)]
B = [list(map(int, input().split())) for _ in range(H)]
Diff = [[0] * (W + 1) for _ in range(H + 1)]
M = 0
for i in range(H):
    for j in range(W):
        m = abs(A[i][j] - B[i][j])
        Diff[i][j] = m
        M += m

dp = [[0] * (W + 1) for _ in range(H + 1)]
dp[0][0] |= (1 << Diff[i][j])

for i in range(0, H):
    for j in range(0, W):
        here = dp[i][j]
        s = Diff[i][j]
        ni = 0
        nj = 0
        ni |= (here << s)
        nj |= (here << s)
        ni |= (here >> s)
        nj |= (here >> s)
        ex = 0
        for k in range(1, s + 1):
            if (here >> k) & 1:
                ex |= (1 << (s - k))
        ni |= ex
        nj |= ex
        dp[i + 1][j] |= ni
        dp[i][j + 1] |= nj

a = dp[H - 1][W - 1]
ans = 0
for k in range(M + 1):
    if (a >> k) & 1:
        ans = k
        break

print(k)

Buggy python submission (verdict: Time Limit Exceeded):
H, W = map(int, input().split())
A = [list(map(int, input().split())) for _ in range(H)]
B = [list(map(int, input().split())) for _ in range(H)]
grid = [[0] * W for _ in range(H)]
for i in range(H):
    for j in range(W):
        grid[i][j] = abs(A[i][j] - B[i][j])

dp = [[set() for _ in range(W)] for _ in range(H)]
dp[0][0].add(grid[0][0])

for i in range(H):
    for j in range(W):
        for k in dp[i][j]:
            if i < H - 1:
                nk = grid[i + 1][j]
                dp[i + 1][j].add(k + nk)
                dp[i + 1][j].add(abs(k - nk))
            if j < W - 1:
                nk = grid[i][j + 1]
                dp[i][j + 1].add(k + nk)
                dp[i][j + 1].add(abs(k - nk))

print(min(dp[-1][-1]))


Fixed submission:
H, W = map(int, input().split())

A = [list(map(int, input().split())) for _ in range(H)]
B = [list(map(int, input().split())) for _ in range(H)]
Diff = [[0] * (W + 1) for _ in range(H + 1)]
M = 0
for i in range(H):
    for j in range(W):
        m = abs(A[i][j] - B[i][j])
        Diff[i][j] = m
        M += m

dp = [[0] * (W + 1) for _ in range(H + 1)]
dp[0][0] |= (1 << Diff[i][j])

for i in range(0, H):
    for j in range(0, W):
        here = dp[i][j]
        s = Diff[i][j]
        ni = 0
        nj = 0
        ni |= (here << s)
        nj |= (here << s)
        ni |= (here >> s)
        nj |= (here >> s)
        ex = 0
        for k in range(1, s + 1):
            if (here >> k) & 1:
                ex |= (1 << (s - k))
        ni |= ex
        nj |= ex
        dp[i + 1][j] |= ni
        dp[i][j + 1] |= nj

a = dp[H - 1][W - 1]
ans = 0
for k in range(M + 1):
    if (a >> k) & 1:
        ans = k
        break

print(k)

Buggy python submission (verdict: Time Limit Exceeded):
H, W = map(int, input().split())

A = [list(map(int, input().split())) for _ in range(H)]
B = [list(map(int, input().split())) for _ in range(H)]
Diff = [[False] * (W + 1) for _ in range(H + 1)]
M = 0
for i in range(H):
    for j in range(W):
        m = abs(A[i][j] - B[i][j])
        Diff[i][j] = m
        M += m

dp = [[[0] * (M + 1) for _ in range(W + 1)] for _ in range(H + 1)]
dp[0][0][Diff[0][0]] = 1

for i in range(0, H):
    for j in range(0, W):
        for k in range(M + 1):
            if dp[i][j][k]:
                dp[i + 1][j][k + Diff[i + 1][j]] |= True
                dp[i + 1][j][abs(k - Diff[i + 1][j])] |= True
                dp[i][j + 1][k + Diff[i][j + 1]] |= True
                dp[i][j + 1][abs(k - Diff[i][j + 1])] |= True

for k in range(M + 1):
    if dp[H - 1][W - 1][k] == 1:
        ans = k
        break

print(ans)


Fixed submission:
H, W = map(int, input().split())

A = [list(map(int, input().split())) for _ in range(H)]
B = [list(map(int, input().split())) for _ in range(H)]
Diff = [[0] * (W + 1) for _ in range(H + 1)]
M = 0
for i in range(H):
    for j in range(W):
        m = abs(A[i][j] - B[i][j])
        Diff[i][j] = m
        M += m

dp = [[0] * (W + 1) for _ in range(H + 1)]
dp[0][0] |= (1 << Diff[i][j])

for i in range(0, H):
    for j in range(0, W):
        here = dp[i][j]
        s = Diff[i][j]
        ni = 0
        nj = 0
        ni |= (here << s)
        nj |= (here << s)
        ni |= (here >> s)
        nj |= (here >> s)
        ex = 0
        for k in range(1, s + 1):
            if (here >> k) & 1:
                ex |= (1 << (s - k))
        ni |= ex
        nj |= ex
        dp[i + 1][j] |= ni
        dp[i][j + 1] |= nj

a = dp[H - 1][W - 1]
ans = 0
for k in range(M + 1):
    if (a >> k) & 1:
        ans = k
        break

print(k)

Buggy python submission (verdict: Runtime Error):
H, W = map(int, input().split())

A = [list(map(int, input().split())) for _ in range(H)]
B = [list(map(int, input().split())) for _ in range(H)]
Diff = [[False] * (W + 1) for _ in range(H + 1)]
M = 0
for i in range(H):
    for j in range(W):
        m = abs(A[i][j] - B[i][j])
        Diff[i][j] = m
        M += m

dp = [[[0] * (M + 1) for _ in range(W + 1)] for _ in range(H + 1)]
dp[0][0][Diff[0][0]] = 1

for i in range(0, H):
    for j in range(0, W):
        for k in range(M + 1):
            if dp[i][j][k]:
                dp[i + 1][j][k + Diff[i + 1][j]] |= True
                dp[i + 1][j][abs(k - Diff[i + 1][j])] |= True
                dp[i][j + 1][k + Diff[i][j + 1]] |= True
                dp[i][j + 1][abs(k - Diff[i][j + 1])] |= True

for k in range(M + 1):
    if dp[H - 1][W - 1][k] == 1:
        ans = k
        break

print(ans)


Fixed submission:
H, W = map(int, input().split())

A = [list(map(int, input().split())) for _ in range(H)]
B = [list(map(int, input().split())) for _ in range(H)]
Diff = [[0] * (W + 1) for _ in range(H + 1)]
M = 0
for i in range(H):
    for j in range(W):
        m = abs(A[i][j] - B[i][j])
        Diff[i][j] = m
        M += m

dp = [[0] * (W + 1) for _ in range(H + 1)]
dp[0][0] |= (1 << Diff[i][j])

for i in range(0, H):
    for j in range(0, W):
        here = dp[i][j]
        s = Diff[i][j]
        ni = 0
        nj = 0
        ni |= (here << s)
        nj |= (here << s)
        ni |= (here >> s)
        nj |= (here >> s)
        ex = 0
        for k in range(1, s + 1):
            if (here >> k) & 1:
                ex |= (1 << (s - k))
        ni |= ex
        nj |= ex
        dp[i + 1][j] |= ni
        dp[i][j + 1] |= nj

a = dp[H - 1][W - 1]
ans = 0
for k in range(M + 1):
    if (a >> k) & 1:
        ans = k
        break

print(k)

Buggy python submission (verdict: Runtime Error):
H, W = map(int, input().split())

A = [list(map(int, input().split())) for _ in range(H)]
B = [list(map(int, input().split())) for _ in range(H)]
Diff = [[0] * (W + 1) for _ in range(H + 1)]
M = 0
for i in range(H):
    for j in range(W):
        m = abs(A[i][j] - B[i][j])
        Diff[i][j] = m
        M = max(M, m)

M = M * H * W

dp = [[[0] * (M + 1) for _ in range(W + 1)] for _ in range(H + 1)]
dp[0][0][Diff[0][0]] = 1

for i in range(0, H):
    for j in range(0, W):
        for k in range(M + 1):
            if dp[i][j][k]:
                dp[i + 1][j][k + Diff[i + 1][j]] = 1
                dp[i + 1][j][abs(k - Diff[i + 1][j])] = 1
                dp[i][j + 1][k + Diff[i][j + 1]] = 1
                dp[i][j + 1][abs(k - Diff[i][j + 1])] = 1

for k in range(M + 1):
    if dp[H - 1][W - 1][k] == 1:
        ans = k
        break

print(ans)


Fixed submission:
H, W = map(int, input().split())

A = [list(map(int, input().split())) for _ in range(H)]
B = [list(map(int, input().split())) for _ in range(H)]
Diff = [[0] * (W + 1) for _ in range(H + 1)]
M = 0
for i in range(H):
    for j in range(W):
        m = abs(A[i][j] - B[i][j])
        Diff[i][j] = m
        M += m

dp = [[0] * (W + 1) for _ in range(H + 1)]
dp[0][0] |= (1 << Diff[i][j])

for i in range(0, H):
    for j in range(0, W):
        here = dp[i][j]
        s = Diff[i][j]
        ni = 0
        nj = 0
        ni |= (here << s)
        nj |= (here << s)
        ni |= (here >> s)
        nj |= (here >> s)
        ex = 0
        for k in range(1, s + 1):
            if (here >> k) & 1:
                ex |= (1 << (s - k))
        ni |= ex
        nj |= ex
        dp[i + 1][j] |= ni
        dp[i][j + 1] |= nj

a = dp[H - 1][W - 1]
ans = 0
for k in range(M + 1):
    if (a >> k) & 1:
        ans = k
        break

print(k)