Buggy python submission (verdict: Time Limit Exceeded):
h, w = map(int, input().split())
n = (h + w) * 80
diff = [list(map(int, input().split())) for _ in range(h)]
for i in range(h):
    for j, b in enumerate(list(map(int, input().split()))):
        diff[i][j] = abs(diff[i][j] - b)
dp = [[0] * (w+1) for i in range(h+1)]
for i in range(h+1): dp[i][0] = -1
for i in range(w+1): dp[0][i] = -1
dp[1][1] = 1 << diff[0][0]

for i in range(1, h+1):
    for j in range(1, w+1):
        d = diff[i-1][j-1]
        for k in range(n):
            if (dp[i-1][j] != -1 and dp[i-1][j] >> k & 1) or (dp[i][j-1] != -1 and dp[i][j-1] >> k & 1):
                dp[i][j] |= 1 << abs(k+d)
                dp[i][j] |= 1 << abs(k-d)

ans = float("inf")
for i in range(n):
    if dp[h][w] >> i & 1:
        ans = min(ans, i)
print(ans)


Fixed submission:
tdlist = lambda i, j, value=0: [[value] * j for _ in range(i)]

h, w = map(int, input().split())
D = 160*80
D2 = D*2+1

diff = [list(map(int, input().split())) for _ in range(h)]
for i in range(h):
    for j, b in enumerate(list(map(int, input().split()))):
        diff[i][j] = abs(diff[i][j] - b)

dp = tdlist(h, w)
dp[0][0] |= 1 << D+diff[0][0]
dp[0][0] |= 1 << D-diff[0][0]

for i in range(h):
    for j in range(w):
        if j:
            dp[i][j] |= dp[i][j-1] << diff[i][j]
            dp[i][j] |= dp[i][j-1] >> diff[i][j]
        if i:
            dp[i][j] |= dp[i-1][j] << diff[i][j]
            dp[i][j] |= dp[i-1][j] >> diff[i][j]

ans = float("inf")
for i in range(D2):
    if dp[h-1][w-1] >> i & 1:
        ans = min(ans, abs(i-D))
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
h, w = map(int, input().split())
n = (h + w) * 80
diff = [list(map(int, input().split())) for _ in range(h)]
for i in range(h):
    for j, b in enumerate(list(map(int, input().split()))):
        diff[i][j] = abs(diff[i][j] - b)
dp = [[0] * (w+1) for i in range(h+1)]
for i in range(h+1): dp[i][0] = -1
for i in range(w+1): dp[0][i] = -1
dp[1][1] = 1 << diff[0][0]

for i in range(1, h+1):
    for j in range(1, w+1):
        d = diff[i-1][j-1]
        for k in range(n):
            if (dp[i-1][j] != -1 and dp[i-1][j] >> k & 1) or (dp[i][j-1] != -1 and dp[i][j-1] >> k & 1):
                dp[i][j] |= 1 << abs(k+d)
                dp[i][j] |= 1 << abs(k-d)

ans = float("inf")
for i in range(n):
    if dp[h][w] >> i & 1:
        ans = min(ans, i)
print(ans)


Fixed submission:
tdlist = lambda i, j, value=0: [[value] * j for _ in range(i)]

h, w = map(int, input().split())
D = 160*80
D2 = D*2+1

diff = [list(map(int, input().split())) for _ in range(h)]
for i in range(h):
    for j, b in enumerate(list(map(int, input().split()))):
        diff[i][j] = abs(diff[i][j] - b)

dp = tdlist(h, w)
dp[0][0] |= 1 << D+diff[0][0]
dp[0][0] |= 1 << D-diff[0][0]

for i in range(h):
    for j in range(w):
        if j:
            dp[i][j] |= dp[i][j-1] << diff[i][j]
            dp[i][j] |= dp[i][j-1] >> diff[i][j]
        if i:
            dp[i][j] |= dp[i-1][j] << diff[i][j]
            dp[i][j] |= dp[i-1][j] >> diff[i][j]

ans = float("inf")
for i in range(D2):
    if dp[h-1][w-1] >> i & 1:
        ans = min(ans, abs(i-D))
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
h, w = map(int, input().split())
diff = [list(map(int, input().split())) for _ in range(h)]
for i in range(h):
    for j, b in enumerate(list(map(int, input().split()))):
        diff[i][j] = abs(diff[i][j] - b)
dp = [[set() for j in range(w+1)] for i in range(h+1)]
dp[1][1].add(diff[0][0])

for i in range(1, h+1):
    for j in range(1, w+1):
        for x in dp[i-1][j]:
            dp[i][j].add(abs(x+diff[i-1][j-1]))
            dp[i][j].add(abs(x-diff[i-1][j-1]))
        for x in dp[i][j-1]:
            dp[i][j].add(abs(x+diff[i-1][j-1]))
            dp[i][j].add(abs(x-diff[i-1][j-1]))

print(min([abs(x) for x in dp[h][w]]))


Fixed submission:
tdlist = lambda i, j, value=0: [[value] * j for _ in range(i)]

h, w = map(int, input().split())
D = 160*80
D2 = D*2+1

diff = [list(map(int, input().split())) for _ in range(h)]
for i in range(h):
    for j, b in enumerate(list(map(int, input().split()))):
        diff[i][j] = abs(diff[i][j] - b)

dp = tdlist(h, w)
dp[0][0] |= 1 << D+diff[0][0]
dp[0][0] |= 1 << D-diff[0][0]

for i in range(h):
    for j in range(w):
        if j:
            dp[i][j] |= dp[i][j-1] << diff[i][j]
            dp[i][j] |= dp[i][j-1] >> diff[i][j]
        if i:
            dp[i][j] |= dp[i-1][j] << diff[i][j]
            dp[i][j] |= dp[i-1][j] >> diff[i][j]

ans = float("inf")
for i in range(D2):
    if dp[h-1][w-1] >> i & 1:
        ans = min(ans, abs(i-D))
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
h, w = map(int, input().split())
diff = [list(map(int, input().split())) for _ in range(h)]
for i in range(h):
    for j, b in enumerate(list(map(int, input().split()))):
        diff[i][j] = abs(diff[i][j] - b)
dp = [[set() for j in range(w+1)] for i in range(h+1)]
dp[1][1].add(diff[0][0])
dp[1][1].add(-diff[0][0])

for i in range(1, h+1):
    for j in range(1, w+1):
        for x in dp[i-1][j]:
            dp[i][j].add(x+diff[i-1][j-1])
            dp[i][j].add(x-diff[i-1][j-1])
        for x in dp[i][j-1]:
            dp[i][j].add(x+diff[i-1][j-1])
            dp[i][j].add(x-diff[i-1][j-1])

print(min([abs(x) for x in dp[h][w]]))


Fixed submission:
tdlist = lambda i, j, value=0: [[value] * j for _ in range(i)]

h, w = map(int, input().split())
D = 160*80
D2 = D*2+1

diff = [list(map(int, input().split())) for _ in range(h)]
for i in range(h):
    for j, b in enumerate(list(map(int, input().split()))):
        diff[i][j] = abs(diff[i][j] - b)

dp = tdlist(h, w)
dp[0][0] |= 1 << D+diff[0][0]
dp[0][0] |= 1 << D-diff[0][0]

for i in range(h):
    for j in range(w):
        if j:
            dp[i][j] |= dp[i][j-1] << diff[i][j]
            dp[i][j] |= dp[i][j-1] >> diff[i][j]
        if i:
            dp[i][j] |= dp[i-1][j] << diff[i][j]
            dp[i][j] |= dp[i-1][j] >> diff[i][j]

ans = float("inf")
for i in range(D2):
    if dp[h-1][w-1] >> i & 1:
        ans = min(ans, abs(i-D))
print(ans)