Buggy python submission (verdict: Time Limit Exceeded):
import sys
input = sys.stdin.readline

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)]
can_make = [[None for _ in range(W)] for _ in range(H)]
for i in range(H):
    for j in range(W):
        x = A[i][j] - B[i][j]
        if i == j == 0:
            can_make[i][j] = set([abs(x)])
            continue
        st = set()
        if i > 0:
            for y in can_make[i-1][j]:
                if abs(y + x) <= 6400:
                    st.add(abs(y + x))
                st.add(abs(y - x))
        if j > 0:
            for y in can_make[i][j-1]:
                if abs(y + x) <= 6400:
                    st.add(abs(y + x))
                st.add(abs(y - x))
        can_make[i][j] = st
print(min(can_make[-1][-1], key=lambda x: abs(x)))



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)]
C = [[abs(A[i][j] - B[i][j]) for j in range(W)] for i in range(H)]

M = (H+W)*80
dp = [[0] * W for _ in range(H)]
dp[0][0] |= 1 << (M-C[0][0])
for i in range(H):
    for j in range(W):
        if i == j == 0:
            continue
        bit = 0
        if i > 0:
            bit |= dp[i-1][j]
        if j > 0:
            bit |= dp[i][j-1]
        dp[i][j] = (bit >> C[i][j]) | (bit << C[i][j])
ans = M
for i in range(M+1):
    if (dp[-1][-1] >> i) & 1:
        ans = min(ans, abs(M-i))
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
import sys
input = sys.stdin.readline

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)]
can_make = [[None for _ in range(W)] for _ in range(H)]
for i in range(H):
    for j in range(W):
        x = A[i][j] - B[i][j]
        if i == j == 0:
            can_make[i][j] = set([abs(x)])
            continue
        st = set()
        if i > 0:
            for y in can_make[i-1][j]:
                st.add(abs(y + x))
                st.add(abs(y - x))
        if j > 0:
            for y in can_make[i][j-1]:
                st.add(abs(y + x))
                st.add(abs(y - x))
        can_make[i][j] = st
print(min(can_make[-1][-1], key=lambda x: abs(x)))



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)]
C = [[abs(A[i][j] - B[i][j]) for j in range(W)] for i in range(H)]

M = (H+W)*80
dp = [[0] * W for _ in range(H)]
dp[0][0] |= 1 << (M-C[0][0])
for i in range(H):
    for j in range(W):
        if i == j == 0:
            continue
        bit = 0
        if i > 0:
            bit |= dp[i-1][j]
        if j > 0:
            bit |= dp[i][j-1]
        dp[i][j] = (bit >> C[i][j]) | (bit << C[i][j])
ans = M
for i in range(M+1):
    if (dp[-1][-1] >> i) & 1:
        ans = min(ans, abs(M-i))
print(ans)

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)]
C = [[abs(A[i][j] - B[i][j]) for j in range(W)] for i in range(H)]

dp = [[[False] * 12801 for j in range(W)] for _ in range(H)]
dp[0][0][C[0][0]] = True
for i in range(H):
    for j in range(W):
        if i == j == 0:
            continue
        for n in range(12801):
            if i > 0 and dp[i-1][j][n] or j > 0 and dp[i][j-1][n]:
                dp[i][j][abs(n-C[i][j])] = True
                dp[i][j][abs(n+C[i][j])] = True

for n in range(12801):
    if dp[H-1][W-1][n]:
        print(n)
        break

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)]
C = [[abs(A[i][j] - B[i][j]) for j in range(W)] for i in range(H)]

M = (H+W)*80
dp = [[0] * W for _ in range(H)]
dp[0][0] |= 1 << (M-C[0][0])
for i in range(H):
    for j in range(W):
        if i == j == 0:
            continue
        bit = 0
        if i > 0:
            bit |= dp[i-1][j]
        if j > 0:
            bit |= dp[i][j-1]
        dp[i][j] = (bit >> C[i][j]) | (bit << C[i][j])
ans = M
for i in range(M+1):
    if (dp[-1][-1] >> i) & 1:
        ans = min(ans, abs(M-i))
print(ans)

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)]
C = [[abs(A[i][j] - B[i][j]) for j in range(W)] for i in range(H)]

dp = [[None] * W for _ in range(H)]
dp[0][0] = {C[0][0]}
for i in range(H):
    for j in range(W):
        if i == j == 0:
            continue
        st = set()
        if i > 0:
            st |= dp[i-1][j]
        if j > 0:
            st |= dp[i][j-1]
        nst = set()
        for n in st:
            nst.add(abs(n-C[i][j]))
            nst.add(abs(n+C[i][j]))
        dp[i][j] = nst

ans = list(dp[H-1][W-1])
ans.sort()
print(ans[0])

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)]
C = [[abs(A[i][j] - B[i][j]) for j in range(W)] for i in range(H)]

M = (H+W)*80
dp = [[0] * W for _ in range(H)]
dp[0][0] |= 1 << (M-C[0][0])
for i in range(H):
    for j in range(W):
        if i == j == 0:
            continue
        bit = 0
        if i > 0:
            bit |= dp[i-1][j]
        if j > 0:
            bit |= dp[i][j-1]
        dp[i][j] = (bit >> C[i][j]) | (bit << C[i][j])
ans = M
for i in range(M+1):
    if (dp[-1][-1] >> i) & 1:
        ans = min(ans, abs(M-i))
print(ans)

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)]
C = [[abs(A[i][j] - B[i][j]) for j in range(W)] for i in range(H)]

memo = {}
def dfs(i, j):
    if i < 0 or i >= H or j < 0 or j >= W:
        return set()
    if i == j == 0:
        return {C[i][j]}
    if (i, j) in memo:
        return memo[(i, j)]
    st = dfs(i, j-1) | dfs(i-1, j)
    ret = set()
    for n in st:
        ret.add(abs(n-C[i][j]))
        ret.add(abs(n+C[i][j]))
    memo[(i, j)] = ret
    return ret

ans = list(dfs(H-1, W-1))
ans.sort()
print(ans[0])

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)]
C = [[abs(A[i][j] - B[i][j]) for j in range(W)] for i in range(H)]

M = (H+W)*80
dp = [[0] * W for _ in range(H)]
dp[0][0] |= 1 << (M-C[0][0])
for i in range(H):
    for j in range(W):
        if i == j == 0:
            continue
        bit = 0
        if i > 0:
            bit |= dp[i-1][j]
        if j > 0:
            bit |= dp[i][j-1]
        dp[i][j] = (bit >> C[i][j]) | (bit << C[i][j])
ans = M
for i in range(M+1):
    if (dp[-1][-1] >> i) & 1:
        ans = min(ans, abs(M-i))
print(ans)