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)]

for i in range(h):
    for j in range(w):
        a[i][j] = abs(a[i][j] - b[i][j])

dp = [[0] * 9600 for _ in range(w*h)]
for i in range(h):
    for j in range(w):
        min_ = max(0, 3200 - min(i+j, 160-i-j)*80)
        max_ = min(9599, 3200 + min(i+j, 160-i-j)*80)
        a_tmp = a[i][j]
        if(i==0)&(j==0):
            dp[i*w+j][3200+a_tmp] += 1
            dp[i*w+j][3200-a_tmp] += 1
        elif(i==0):
            for k in range(min_, max_+1):
                if(k+a_tmp < 9600):
                    dp[i*w+j][k+a_tmp] += dp[i*w+j-1][k]
                if(k-a_tmp >= 0):
                    dp[i*w+j][k-a_tmp] += dp[i*w+j-1][k]
        elif(j==0):
            for k in range(min_, max_+1):
                if(k+a_tmp < 9600):
                    dp[i*w+j][k+a_tmp] += dp[i*w+j-w][k]
                if(k+a_tmp >= 0):
                    dp[i*w+j][k-a_tmp] += dp[i*w+j-w][k]
        else:
            for k in range(min_, max_+1):
                if(k+a_tmp < 9600):
                    dp[i*w+j][k+a_tmp] += dp[i*w+j-1][k]
                    dp[i*w+j][k+a_tmp] += dp[i*w+j-w][k]
                if(k+a_tmp >= 0):
                    dp[i*w+j][k-a_tmp] += dp[i*w+j-1][k]
                    dp[i*w+j][k-a_tmp] += dp[i*w+j-w][k]

ans = 3200
for i in range(3100, 3300):
    if(dp[-1][i] > 0):
        ans = min(ans, abs(i-3200))

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)]

for i in range(h):
    for j in range(w):
        a[i][j] = abs(a[i][j] - b[i][j])

base = 2**12800 - 1
dp = [[0] * (w+1) for _ in range(h+1)]
dp[1][1] = (2**6400 >> a[0][0])|(2**6400 << a[0][0])&base
for i in range(1,h+1):
    for j in range(1,w+1):
        if(i==1)&(j==1):
            dp[1][1] = (2**6400 >> a[0][0])|(2**6400 << a[0][0])&base
            continue

        dp[i][j] = ((dp[i-1][j] >> a[i-1][j-1])|(dp[i-1][j] << a[i-1][j-1])|
                    (dp[i][j-1] >> a[i-1][j-1])|(dp[i][j-1] << a[i-1][j-1]))&base

ans = 6400
ans_bit = dp[-1][-1]
for i in range(6300,6500):
    if((ans_bit >> i)&1 == 1):
        ans = min(ans, abs(6400-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)]

for i in range(h):
    for j in range(w):
        a[i][j] = abs(a[i][j] - b[i][j])

dp = [[0] * 9600 for _ in range(w)]
for i in range(h):
    for j in range(w):
        min_ = max(0, 3200 - min(i+j, 160-i-j)*80)
        max_ = min(9599, 3200 + min(i+j, 160-i-j)*80)
        a_tmp = a[i][j]
        if(i==0)&(j==0):
            dp[j][3200+a_tmp] += 1
            dp[j][3200-a_tmp] += 1
        elif(i==0):
            for k in range(min_, max_+1):
                if(k+a_tmp < 9600):
                    dp[j][k+a_tmp] += dp[j-1][k]
                if(k-a_tmp >= 0):
                    dp[j][k-a_tmp] += dp[j-1][k]
        elif(j==0):
            tmp = [0] * 9600
            for k in range(min_, max_+1):
                if(k+a_tmp < 9600):
                    tmp[k+a_tmp] += dp[j][k]
                if(k+a_tmp >= 0):
                    tmp[k-a_tmp] += dp[j][k]
            dp[j] = tmp[::]
        else:
            tmp = [0] * 9600
            for k in range(min_, max_+1):
                if(k+a_tmp < 9600):
                    tmp[k+a_tmp] += dp[j-1][k]
                    tmp[k+a_tmp] += dp[j][k]
                if(k+a_tmp >= 0):
                    tmp[k-a_tmp] += dp[j-1][k]
                    tmp[k-a_tmp] += dp[j][k]
            dp[j] = tmp[::]

ans = 3200
for i in range(3100, 3300):
    if(dp[-1][i] > 0):
        ans = min(ans, abs(i-3200))

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)]

for i in range(h):
    for j in range(w):
        a[i][j] = abs(a[i][j] - b[i][j])

base = 2**12800 - 1
dp = [[0] * (w+1) for _ in range(h+1)]
dp[1][1] = (2**6400 >> a[0][0])|(2**6400 << a[0][0])&base
for i in range(1,h+1):
    for j in range(1,w+1):
        if(i==1)&(j==1):
            dp[1][1] = (2**6400 >> a[0][0])|(2**6400 << a[0][0])&base
            continue

        dp[i][j] = ((dp[i-1][j] >> a[i-1][j-1])|(dp[i-1][j] << a[i-1][j-1])|
                    (dp[i][j-1] >> a[i-1][j-1])|(dp[i][j-1] << a[i-1][j-1]))&base

ans = 6400
ans_bit = dp[-1][-1]
for i in range(6300,6500):
    if((ans_bit >> i)&1 == 1):
        ans = min(ans, abs(6400-i))

print(ans)

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)]

for i in range(h):
    for j in range(w):
        a[i][j] = abs(a[i][j] - b[i][j])

dp = [[0] * 12800 for _ in range(w)]
for i in range(h):
    for j in range(w):
        min_ = max(0, 6400 - min(i+j, 160-i-j)*80)
        max_ = min(12799, 6400 + min(i+j, 160-i-j)*80)
        if(i==0)&(j==0):
            dp[j][6400+a[i][j]] += 1
            dp[j][6400-a[i][j]] += 1
        elif(i==0):
            for k in range(min_, max_+1):
                dp[j][k+a[i][j]] += dp[j-1][k]
                dp[j][k-a[i][j]] += dp[j-1][k]
        elif(j==0):
            tmp = [0] * 12800
            for k in range(min_, max_+1):
                tmp[k+a[i][j]] += dp[j][k]
                tmp[k-a[i][j]] += dp[j][k]
            dp[j] = tmp[::]
        else:
            tmp = [0] * 12800
            for k in range(min_, max_+1):
                tmp[k+a[i][j]] += dp[j-1][k]
                tmp[k-a[i][j]] += dp[j-1][k]
                tmp[k+a[i][j]] += dp[j][k]
                tmp[k-a[i][j]] += dp[j][k]
            dp[j] = tmp[::]

ans = 6400
for i in range(6300, 6500):
    if(dp[-1][i] > 0):
        ans = min(ans, abs(i-6400))

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)]

for i in range(h):
    for j in range(w):
        a[i][j] = abs(a[i][j] - b[i][j])

base = 2**12800 - 1
dp = [[0] * (w+1) for _ in range(h+1)]
dp[1][1] = (2**6400 >> a[0][0])|(2**6400 << a[0][0])&base
for i in range(1,h+1):
    for j in range(1,w+1):
        if(i==1)&(j==1):
            dp[1][1] = (2**6400 >> a[0][0])|(2**6400 << a[0][0])&base
            continue

        dp[i][j] = ((dp[i-1][j] >> a[i-1][j-1])|(dp[i-1][j] << a[i-1][j-1])|
                    (dp[i][j-1] >> a[i-1][j-1])|(dp[i][j-1] << a[i-1][j-1]))&base

ans = 6400
ans_bit = dp[-1][-1]
for i in range(6300,6500):
    if((ans_bit >> i)&1 == 1):
        ans = min(ans, abs(6400-i))

print(ans)