Buggy python submission (verdict: Time Limit Exceeded):
h,w = map(int,input().split())
al = []
for _ in range(h):
    a = list(map(int,input().split()))
    al.append(a)

bl = []
for _ in range(h):
    b = list(map(int,input().split()))
    bl.append(b)

abl = [[0 for _ in range(w)] for _ in range(h)]
for i in range(h):
    for j in range(w):
        abl[i][j] = al[i][j] - bl[i][j]

from collections import defaultdict
dic = [[[0 for i in range(12801)] for _ in range(w)] for _ in range(h)]

dic[0][0][abl[i][j] + 6400] = 1
dic[0][0][-abl[i][j]+ 6400] = 1

for i in range(h):
    for j in range(w):
        for v, t in enumerate(dic[i][j]):
            if t == 1:
                if j + 1 < w:
                    if 0 <= v+abl[i][j+1] <= 12800:
                        dic[i][j+1][v+abl[i][j+1]] = 1
                    if 0 <= v-abl[i][j+1] <= 12800:
                        dic[i][j+1][v-abl[i][j+1]] = 1
                if i + 1 < h:
                    if 0 <=v+abl[i+1][j] <= 12800:
                        dic[i+1][j][v+abl[i+1][j]] = 1
                    if 0 <= v-abl[i+1][j] <= 12800:
                        dic[i+1][j][v-abl[i+1][j]] = 1

ans = float("inf")
for idx,i in enumerate(dic[-1][-1]):
    if i == 1:
        ans = min(ans, abs(idx-6401))
print(ans)




Fixed submission:
h,w = map(int,input().split())

bitdp = [[0 for j in range(w)] for i in range(h)]
al = []
bl = []
for _ in range(h):
   a = list(map(int,input().split()))
   al.append(a)
for _ in range(h):
   b = list(map(int,input().split()))
   bl.append(b)
abl = [[] for i in range(h)]
for i in range(h):
   for j in range(w):
      abl[i].append(abs(al[i][j] - bl[i][j]))

bitdp[0][0] = 1 << h*w+abl[0][0]
for i in range(h):
   for j in range(w):
      if j != w-1:
         bitdp[i][j+1] |= bitdp[i][j] << abl[i][j+1] | bitdp[i][j] >> abl[i][j+1]
      if i != h-1:
         bitdp[i+1][j] |= bitdp[i][j] << abl[i+1][j] | bitdp[i][j] >> abl[i+1][j]

ans = []
for i in range(h*w*2+1):
   if (bitdp[-1][-1] >> i & 1):
      ans.append(abs(h*w-i))

print(min(ans))

Buggy python submission (verdict: Time Limit Exceeded):
h,w = map(int,input().split())
al = []
for _ in range(h):
    a = list(map(int,input().split()))
    al.append(a)

bl = []
for _ in range(h):
    b = list(map(int,input().split()))
    bl.append(b)

abl = [[0 for _ in range(w)] for _ in range(h)]
for i in range(h):
    for j in range(w):
        abl[i][j] = al[i][j] - bl[i][j]

from collections import defaultdict
dic = defaultdict(set)

dic[(0,0)].add(abl[0][0])
dic[(0,0)].add(-abl[0][0])
for i in range(h):
    for j in range(w):
        for v in dic[(i,j)]:
            if j + 1 < w:
                if -6400 <= v+abl[i][j+1] <= 6400:
                    dic[(i,j+1)].add(v+abl[i][j+1])
                if -6400 <= v-abl[i][j+1] <= 6400:
                    dic[(i,j+1)].add(v-abl[i][j+1])
            if i + 1 < h:
                if -6400 <= v+abl[i+1][j] <= 6400:
                    dic[(i+1,j)].add(v+abl[i+1][j])
                if -6400 <= v-abl[i+1][j] <= 6400:
                    dic[(i+1,j)].add(v-abl[i+1][j])

ans = float("inf")
for i in dic[(h-1, w-1)]:
    ans = min(abs(i), ans)
print(ans)




Fixed submission:
h,w = map(int,input().split())

bitdp = [[0 for j in range(w)] for i in range(h)]
al = []
bl = []
for _ in range(h):
   a = list(map(int,input().split()))
   al.append(a)
for _ in range(h):
   b = list(map(int,input().split()))
   bl.append(b)
abl = [[] for i in range(h)]
for i in range(h):
   for j in range(w):
      abl[i].append(abs(al[i][j] - bl[i][j]))

bitdp[0][0] = 1 << h*w+abl[0][0]
for i in range(h):
   for j in range(w):
      if j != w-1:
         bitdp[i][j+1] |= bitdp[i][j] << abl[i][j+1] | bitdp[i][j] >> abl[i][j+1]
      if i != h-1:
         bitdp[i+1][j] |= bitdp[i][j] << abl[i+1][j] | bitdp[i][j] >> abl[i+1][j]

ans = []
for i in range(h*w*2+1):
   if (bitdp[-1][-1] >> i & 1):
      ans.append(abs(h*w-i))

print(min(ans))

Buggy python submission (verdict: Time Limit Exceeded):
h,w = map(int,input().split())
al = []
for _ in range(h):
    a = list(map(int,input().split()))
    al.append(a)

bl = []
for _ in range(h):
    b = list(map(int,input().split()))
    bl.append(b)

abl = [[0 for _ in range(w)] for _ in range(h)]
for i in range(h):
    for j in range(w):
        abl[i][j] = al[i][j] - bl[i][j]

from collections import defaultdict
dic = defaultdict(set)

dic[(0,0)].add(abl[0][0])
dic[(0,0)].add(-abl[0][0])
for i in range(h):
    for j in range(w):
        for v in dic[(i,j)]:
            if j + 1 < w:
                if v+abl[i][j+1] <= 80:
                    dic[(i,j+1)].add(v+abl[i][j+1])
                if -80 <= v-abl[i][j+1]:
                    dic[(i,j+1)].add(v-abl[i][j+1])
            if i + 1 < h:
                if v+abl[i+1][j] <= 80:
                    dic[(i+1,j)].add(v+abl[i+1][j])
                if - 80 <= v-abl[i+1][j]:
                    dic[(i+1,j)].add(v-abl[i+1][j])

ans = float("inf")
for i in dic[(h-1, w-1)]:
    ans = min(abs(i), ans)
print(ans)




Fixed submission:
h,w = map(int,input().split())

bitdp = [[0 for j in range(w)] for i in range(h)]
al = []
bl = []
for _ in range(h):
   a = list(map(int,input().split()))
   al.append(a)
for _ in range(h):
   b = list(map(int,input().split()))
   bl.append(b)
abl = [[] for i in range(h)]
for i in range(h):
   for j in range(w):
      abl[i].append(abs(al[i][j] - bl[i][j]))

bitdp[0][0] = 1 << h*w+abl[0][0]
for i in range(h):
   for j in range(w):
      if j != w-1:
         bitdp[i][j+1] |= bitdp[i][j] << abl[i][j+1] | bitdp[i][j] >> abl[i][j+1]
      if i != h-1:
         bitdp[i+1][j] |= bitdp[i][j] << abl[i+1][j] | bitdp[i][j] >> abl[i+1][j]

ans = []
for i in range(h*w*2+1):
   if (bitdp[-1][-1] >> i & 1):
      ans.append(abs(h*w-i))

print(min(ans))

Buggy python submission (verdict: Time Limit Exceeded):
h,w = map(int,input().split())
al = []
for _ in range(h):
    a = list(map(int,input().split()))
    al.append(a)

bl = []
for _ in range(h):
    b = list(map(int,input().split()))
    bl.append(b)

abl = [[0 for _ in range(w)] for _ in range(h)]
for i in range(h):
    for j in range(w):
        abl[i][j] = al[i][j] - bl[i][j]

from collections import defaultdict
dic = defaultdict(set)

dic[(0,0)].add(abl[0][0])
dic[(0,0)].add(-abl[0][0])
for i in range(h):
    for j in range(w):
        for v in dic[(i,j)]:
            if j + 1 < w:
                dic[(i,j+1)].add(v+abl[i][j+1])
                dic[(i,j+1)].add(v-abl[i][j+1])
            if i + 1 < h:
                dic[(i+1,j)].add(v+abl[i+1][j])
                dic[(i+1,j)].add(v-abl[i+1][j])

ans = float("inf")
for i in dic[(h-1, w-1)]:
    ans = min(abs(i), ans)
print(ans)




Fixed submission:
h,w = map(int,input().split())

bitdp = [[0 for j in range(w)] for i in range(h)]
al = []
bl = []
for _ in range(h):
   a = list(map(int,input().split()))
   al.append(a)
for _ in range(h):
   b = list(map(int,input().split()))
   bl.append(b)
abl = [[] for i in range(h)]
for i in range(h):
   for j in range(w):
      abl[i].append(abs(al[i][j] - bl[i][j]))

bitdp[0][0] = 1 << h*w+abl[0][0]
for i in range(h):
   for j in range(w):
      if j != w-1:
         bitdp[i][j+1] |= bitdp[i][j] << abl[i][j+1] | bitdp[i][j] >> abl[i][j+1]
      if i != h-1:
         bitdp[i+1][j] |= bitdp[i][j] << abl[i+1][j] | bitdp[i][j] >> abl[i+1][j]

ans = []
for i in range(h*w*2+1):
   if (bitdp[-1][-1] >> i & 1):
      ans.append(abs(h*w-i))

print(min(ans))