Buggy python submission (verdict: Time Limit Exceeded):
X, Y, Z, K = map(int, input().split())
 
A_list = list(map(int, input().split()))
B_list = list(map(int, input().split()))
C_list = list(map(int, input().split()))
 
AB_list = [0]*(X*Y)
for i in range(X):
    for j in range(Y):
        AB_list[i*Y+j] = A_list[i] + B_list[j]
AB_list_s = sorted(AB_list)
if len(AB_list_s) > 3000:
    AB_list_s = AB_list_s[-3000:]
W = len(AB_list_s)
ABC_list = [0]*(W*Z)
for i in range(W):
    for j in range(Z):
        ABC_list[i*Z+j] = AB_list_s[i] + C_list[j]
ABC_list_s = sorted(ABC_list)
for i in range(K):
    print(ABC_list_s[-(i+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=sorted([-i for i in a])
b=sorted([-i for i in b])
c=sorted([-i for i in c]) # avoid reverse=True 
a_dif=[a[i+1]-a[i] for i in range(x-1)]
b_dif=[b[i+1]-b[i] for i in range(y-1)]
c_dif=[c[i+1]-c[i] for i in range(z-1)]#差分をとる

que=[(a[0]+b[0]+c[0],(0,0,0))]
heapq.heapify(que)
s=set([(0,0,0)])
while k>0:
    ans,(ia,ib,ic)=heapq.heappop(que)
    print(-ans) #because sort with - 
    k-=1
    
    if ia < x-1 and (ia+1,ib,ic) not in s:
        heapq.heappush(que,(ans+a_dif[ia],(ia+1,ib,ic)))
        s.add((ia+1,ib,ic))
    if ib < y-1 and (ia, ib+1, ic) not in s:
        heapq.heappush(que, (ans+b_dif[ib], (ia, ib+1, ic)))
        s.add((ia, ib+1, ic))
    if ic < z-1 and (ia, ib, ic+1) not in s:
        heapq.heappush(que, (ans+c_dif[ic], (ia, ib, ic+1)))
        s.add((ia, ib, ic+1))

Buggy python submission (verdict: Time Limit Exceeded):
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_B=[0]*(X*Y)
for i in range(X):
    for j in range(Y):
        A_B[i*Y+j]=A[i]+B[j]
A_B_s=sorted(A_B,reverse=True)
if len(A_B_s)>3000:
    A_B_s=A_B_s[:3000]
W=len(A_B_s)
A_B_C=[0]*(W*Z)
for i in range(W):
    for j in range(Z):
        A_B_C[Z*i+j]=A_B_s[i]+C[j]
A_B_C_s=sorted(A_B_C,reverse=True)
for i in range(K):
    print(A_B_C_s[i])

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=sorted([-i for i in a])
b=sorted([-i for i in b])
c=sorted([-i for i in c]) # avoid reverse=True 
a_dif=[a[i+1]-a[i] for i in range(x-1)]
b_dif=[b[i+1]-b[i] for i in range(y-1)]
c_dif=[c[i+1]-c[i] for i in range(z-1)]#差分をとる

que=[(a[0]+b[0]+c[0],(0,0,0))]
heapq.heapify(que)
s=set([(0,0,0)])
while k>0:
    ans,(ia,ib,ic)=heapq.heappop(que)
    print(-ans) #because sort with - 
    k-=1
    
    if ia < x-1 and (ia+1,ib,ic) not in s:
        heapq.heappush(que,(ans+a_dif[ia],(ia+1,ib,ic)))
        s.add((ia+1,ib,ic))
    if ib < y-1 and (ia, ib+1, ic) not in s:
        heapq.heappush(que, (ans+b_dif[ib], (ia, ib+1, ic)))
        s.add((ia, ib+1, ic))
    if ic < z-1 and (ia, ib, ic+1) not in s:
        heapq.heappush(que, (ans+c_dif[ic], (ia, ib, ic+1)))
        s.add((ia, ib, ic+1))

Buggy python submission (verdict: Time Limit Exceeded):
X,Y,Z,K=map(int,input().split())
A=[int(i) for i in input().split()]
B=[int(i) for i in input().split()]
C=[int(i) for i in input().split()]
A_B=[0]*(X*Y)
for i in range(X):
    for j in range(Y):
        A_B[i*Y+j]=A[i]+B[j]
A_B.sort(reverse=True)
if len(A_B)>3000:
    A_B=A_B[:3000]
W=len(A_B)
A_B_C=[0]*(W*Z)
for i in range(W):
    for j in range(Z):
        A_B_C[Z*i+j]=A_B[i]+C[j]
A_B_C.sort(reverse=True)
for i in range(K):
    print(A_B_C[i])

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=sorted([-i for i in a])
b=sorted([-i for i in b])
c=sorted([-i for i in c]) # avoid reverse=True 
a_dif=[a[i+1]-a[i] for i in range(x-1)]
b_dif=[b[i+1]-b[i] for i in range(y-1)]
c_dif=[c[i+1]-c[i] for i in range(z-1)]#差分をとる

que=[(a[0]+b[0]+c[0],(0,0,0))]
heapq.heapify(que)
s=set([(0,0,0)])
while k>0:
    ans,(ia,ib,ic)=heapq.heappop(que)
    print(-ans) #because sort with - 
    k-=1
    
    if ia < x-1 and (ia+1,ib,ic) not in s:
        heapq.heappush(que,(ans+a_dif[ia],(ia+1,ib,ic)))
        s.add((ia+1,ib,ic))
    if ib < y-1 and (ia, ib+1, ic) not in s:
        heapq.heappush(que, (ans+b_dif[ib], (ia, ib+1, ic)))
        s.add((ia, ib+1, ic))
    if ic < z-1 and (ia, ib, ic+1) not in s:
        heapq.heappush(que, (ans+c_dif[ic], (ia, ib, ic+1)))
        s.add((ia, ib, ic+1))