Buggy python submission (verdict: Runtime Error):
import heapq
import numpy as np
import sys
sys.setrecursionlimit(10 ** 9)

x, y, z, k =  map(int,input().split())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
c = list(map(int, input().split()))

a.sort(reverse=True)
b.sort(reverse=True)
c.sort(reverse=True)

hq = [[-a[0]-b[0]-c[0], 0, 0, 0]]
heapq.heapify(hq)
# visited = [[[0] * z for yy in range(y)] for xx in range(x)]
visited = np.zeros((x, y, z), dtype=int)

for i in range(k):
    ii, ia, ib, ic = heapq.heappop(hq)
    print(-ii)
    na = min(ia+1, x-1)
    nb = min(ib+1, y-1)
    nc = min(ic+1, z-1)
    if visited[na][ib][ic] == 0:
        heapq.heappush(hq, [-a[na] -b[ib] -c[ic], na, ib, ic])
        visited[na][ib][ic] = 1
    if visited[ia][nb][ic] == 0:
        heapq.heappush(hq, [-a[ia] -b[nb] -c[ic], ia, nb, ic])
        visited[ia][nb][ic] = 1
    if visited[ia][ib][nc] == 0:
        heapq.heappush(hq, [-a[ia] -b[ib] -c[nc], ia, ib, nc])
        visited[ia][ib][nc] = 1


Fixed submission:
import heapq

x, y, z, k =  map(int,input().split())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
c = list(map(int, input().split()))

a.sort(reverse=True)
b.sort(reverse=True)
c.sort(reverse=True)

hq = [[-a[0]-b[0]-c[0], 0, 0, 0]]
heapq.heapify(hq)
visited = {(0,0,0)}

for i in range(k):
    ii, ia, ib, ic = heapq.heappop(hq)
    print(-ii)
    na = min(ia+1, x-1)
    nb = min(ib+1, y-1)
    nc = min(ic+1, z-1)
    if not (na, ib, ic) in visited:
        heapq.heappush(hq, [-a[na] -b[ib] -c[ic], na, ib, ic])
        visited.add((na, ib, ic))
    if not (ia, nb, ic) in visited:
        heapq.heappush(hq, [-a[ia] -b[nb] -c[ic], ia, nb, ic])
        visited.add((ia, nb, ic))
    if not (ia, ib, nc) in visited:
        heapq.heappush(hq, [-a[ia] -b[ib] -c[nc], ia, ib, nc])
        visited.add((ia, ib, nc))

Buggy python submission (verdict: Runtime Error):
import heapq
import numpy as np

x, y, z, k =  map(int,input().split())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
c = list(map(int, input().split()))

a.sort(reverse=True)
b.sort(reverse=True)
c.sort(reverse=True)

hq = [[-a[0]-b[0]-c[0], 0, 0, 0]]
heapq.heapify(hq)
# visited = [[[0] * z for yy in range(y)] for xx in range(x)]
visited = np.zeros((x, y, z), dtype=int)

for i in range(k):
    ii, ia, ib, ic = heapq.heappop(hq)
    print(-ii)
    na = min(ia+1, x-1)
    nb = min(ib+1, y-1)
    nc = min(ic+1, z-1)
    if visited[na][ib][ic] == 0:
        heapq.heappush(hq, [-a[na] -b[ib] -c[ic], na, ib, ic])
        visited[na][ib][ic] = 1
    if visited[ia][nb][ic] == 0:
        heapq.heappush(hq, [-a[ia] -b[nb] -c[ic], ia, nb, ic])
        visited[ia][nb][ic] = 1
    if visited[ia][ib][nc] == 0:
        heapq.heappush(hq, [-a[ia] -b[ib] -c[nc], ia, ib, nc])
        visited[ia][ib][nc] = 1


Fixed submission:
import heapq

x, y, z, k =  map(int,input().split())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
c = list(map(int, input().split()))

a.sort(reverse=True)
b.sort(reverse=True)
c.sort(reverse=True)

hq = [[-a[0]-b[0]-c[0], 0, 0, 0]]
heapq.heapify(hq)
visited = {(0,0,0)}

for i in range(k):
    ii, ia, ib, ic = heapq.heappop(hq)
    print(-ii)
    na = min(ia+1, x-1)
    nb = min(ib+1, y-1)
    nc = min(ic+1, z-1)
    if not (na, ib, ic) in visited:
        heapq.heappush(hq, [-a[na] -b[ib] -c[ic], na, ib, ic])
        visited.add((na, ib, ic))
    if not (ia, nb, ic) in visited:
        heapq.heappush(hq, [-a[ia] -b[nb] -c[ic], ia, nb, ic])
        visited.add((ia, nb, ic))
    if not (ia, ib, nc) in visited:
        heapq.heappush(hq, [-a[ia] -b[ib] -c[nc], ia, ib, nc])
        visited.add((ia, ib, nc))

Buggy python submission (verdict: Time Limit Exceeded):
import heapq

x, y, z, k =  map(int,input().split())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
c = list(map(int, input().split()))

a.sort(reverse=True)
b.sort(reverse=True)
c.sort(reverse=True)

hq = [[-a[0]-b[0]-c[0], 0, 0, 0]]
heapq.heapify(hq)
visited = [[[0] * z for yy in range(y)] for xx in range(x)]
for i in range(k):
    ii, ia, ib, ic = heapq.heappop(hq)
    print(-ii)
    na = min(ia+1, x-1)
    nb = min(ib+1, y-1)
    nc = min(ic+1, z-1)
    if visited[na][ib][ic] == 0:
        heapq.heappush(hq, [-a[na] -b[ib] -c[ic], na, ib, ic])
        visited[na][ib][ic] = 1
    if visited[ia][nb][ic] == 0:
        heapq.heappush(hq, [-a[ia] -b[nb] -c[ic], ia, nb, ic])
        visited[ia][nb][ic] = 1
    if visited[ia][ib][nc] == 0:
        heapq.heappush(hq, [-a[ia] -b[ib] -c[nc], ia, ib, nc])
        visited[ia][ib][nc] = 1

Fixed submission:
import heapq

x, y, z, k =  map(int,input().split())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
c = list(map(int, input().split()))

a.sort(reverse=True)
b.sort(reverse=True)
c.sort(reverse=True)

hq = [[-a[0]-b[0]-c[0], 0, 0, 0]]
heapq.heapify(hq)
visited = {(0,0,0)}

for i in range(k):
    ii, ia, ib, ic = heapq.heappop(hq)
    print(-ii)
    na = min(ia+1, x-1)
    nb = min(ib+1, y-1)
    nc = min(ic+1, z-1)
    if not (na, ib, ic) in visited:
        heapq.heappush(hq, [-a[na] -b[ib] -c[ic], na, ib, ic])
        visited.add((na, ib, ic))
    if not (ia, nb, ic) in visited:
        heapq.heappush(hq, [-a[ia] -b[nb] -c[ic], ia, nb, ic])
        visited.add((ia, nb, ic))
    if not (ia, ib, nc) in visited:
        heapq.heappush(hq, [-a[ia] -b[ib] -c[nc], ia, ib, nc])
        visited.add((ia, ib, nc))

Buggy python submission (verdict: Time Limit Exceeded):
import heapq

x, y, z, k =  map(int,input().split())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
c = list(map(int, input().split()))

a.sort(reverse=True)
b.sort(reverse=True)
c.sort(reverse=True)

hq = [[-a[0]-b[0]-c[0], 0, 0, 0]]
heapq.heapify(hq)
visited = [[[0] * z for yy in range(y)] for xx in range(x)]
for i in range(k):
    ii, ia, ib, ic = heapq.heappop(hq)
    print(-ii)
    na = min(ia+1, x-1)
    nb = min(ib+1, y-1)
    nc = min(ic+1, z-1)
    if visited[na][ib][ic] == 0:
        heapq.heappush(hq, [-a[na] -b[ib] -c[ic], na, ib, ic])
        visited[na][ib][ic] = 1
    if visited[ia][nb][ic] == 0:
        heapq.heappush(hq, [-a[ia] -b[nb] -c[ic], ia, nb, ic])
        visited[ia][nb][ic] = 1
    if visited[ia][ib][nc] == 0:
        heapq.heappush(hq, [-a[ia] -b[ib] -c[nc], ia, ib, nc])
        visited[ia][ib][nc] = 1



Fixed submission:
import heapq

x, y, z, k =  map(int,input().split())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
c = list(map(int, input().split()))

a.sort(reverse=True)
b.sort(reverse=True)
c.sort(reverse=True)

hq = [[-a[0]-b[0]-c[0], 0, 0, 0]]
heapq.heapify(hq)
visited = {(0,0,0)}

for i in range(k):
    ii, ia, ib, ic = heapq.heappop(hq)
    print(-ii)
    na = min(ia+1, x-1)
    nb = min(ib+1, y-1)
    nc = min(ic+1, z-1)
    if not (na, ib, ic) in visited:
        heapq.heappush(hq, [-a[na] -b[ib] -c[ic], na, ib, ic])
        visited.add((na, ib, ic))
    if not (ia, nb, ic) in visited:
        heapq.heappush(hq, [-a[ia] -b[nb] -c[ic], ia, nb, ic])
        visited.add((ia, nb, ic))
    if not (ia, ib, nc) in visited:
        heapq.heappush(hq, [-a[ia] -b[ib] -c[nc], ia, ib, nc])
        visited.add((ia, ib, nc))