Buggy python submission (verdict: Runtime Error):
ans=10**8
h,w,K=map(int,input().split())
s=[]
import copy
def two(x):
	return "0"*(h-1-len(bin(x)[2:]))+bin(x)[2:]
for i in range(h):
	s.append(input())
for i in range(2**(h-1)):
	r=two(i)
	pre_ans=r.count("1")
	d=[0]*(pre_ans+1)
	cnt=0
	for j in range(w):
		now=0
		for k in range(h):
			if s[k][j]=="1":
				d[now]+=1
			if k!=h-1:
				if r[k]=="1":
					now+=1
		if max(d)>K:
			e=[]
			for x in range(len(d)):
				e.append(d[x]-dd[x])
			d=copy.copy(e)
			cnt+=1
	# 	if max(d)>K:
	# 		cnt=10**7
	# 	dd=copy.copy(d)
	# pre_ans+=cnt
	# ans=min(ans,pre_ans)
print(ans)

Fixed submission:
ans=10**8
h,w,K=map(int,input().split())
s=[]
import copy
def two(x):
	return "0"*(h-1-len(bin(x)[2:]))+bin(x)[2:]
for i in range(h):
	s.append(input())
for i in range(2**(h-1)):
	r=two(i)
	pre_ans=r.count("1")
	d=[0]*(pre_ans+1)
	dd=copy.copy(d)
	cnt=0
	for j in range(w):
		now=0
		for k in range(h):
			if s[k][j]=="1":
				d[now]+=1
			if k!=h-1:
				if r[k]=="1":
					now+=1
		if max(d)>K:
			e=[]
			for x in range(len(d)):
				e.append(d[x]-dd[x])
			d=copy.copy(e)
			cnt+=1
		if max(d)>K:
			cnt=10**7
		dd=copy.copy(d)
	pre_ans+=cnt
	ans=min(ans,pre_ans)
print(ans)

Buggy python submission (verdict: Runtime Error):
ans=10**8
h,w,K=map(int,input().split())
s=[]
import copy
def two(x):
	return "0"*(h-1-len(bin(x)[2:]))+bin(x)[2:]
for i in range(h):
	s.append(input())
for i in range(2**(h-1)):
	r=two(i)
	pre_ans=r.count("1")
	d=[0]*(pre_ans+1)
	cnt=0
	for j in range(w):
		now=0
		for k in range(h):
			if s[k][j]=="1":
				d[now]+=1
			if k!=h-1:
				if r[k]=="1":
					now+=1
		if max(d)>K:
			e=[]
			for x in range(len(d)):
				e.append(d[x]-dd[x])
			d=copy.copy(e)
			cnt+=1
		if max(d)>K:
			cnt=10**7
		dd=copy.copy(d)
	pre_ans+=cnt
	ans=min(ans,pre_ans)
print(ans)

Fixed submission:
ans=10**8
h,w,K=map(int,input().split())
s=[]
import copy
def two(x):
	return "0"*(h-1-len(bin(x)[2:]))+bin(x)[2:]
for i in range(h):
	s.append(input())
for i in range(2**(h-1)):
	r=two(i)
	pre_ans=r.count("1")
	d=[0]*(pre_ans+1)
	dd=copy.copy(d)
	cnt=0
	for j in range(w):
		now=0
		for k in range(h):
			if s[k][j]=="1":
				d[now]+=1
			if k!=h-1:
				if r[k]=="1":
					now+=1
		if max(d)>K:
			e=[]
			for x in range(len(d)):
				e.append(d[x]-dd[x])
			d=copy.copy(e)
			cnt+=1
		if max(d)>K:
			cnt=10**7
		dd=copy.copy(d)
	pre_ans+=cnt
	ans=min(ans,pre_ans)
print(ans)

Buggy python submission (verdict: Runtime Error):
ans=10**8
h,w,K=map(int,input().split())
s=[]
import copy
def two(x):
	return "0"*(h-1-len(bin(x)[2:]))+bin(x)[2:]
for i in range(h):
	s.append(input())
for i in range(2**(h-1)):
	r=two(i)
	pre_ans=r.count("1")
	d=[0]*(pre_ans+2)
	cnt=0
	for j in range(w):
		now=0
		for k in range(h):
			if s[k][j]=="1":
				d[now]+=1
			if k!=h-1:
				if r[k]=="1":
					now+=1
		if max(d)>K:
			e=[]
			for x in range(len(dd)):
				e.append(d[x]-dd[x])
			d=copy.copy(e)
			cnt+=1
		if max(d)>K:
			pre_ans=10**7
			break
		dd=copy.copy(d)
	pre_ans+=cnt
	ans=min(ans,pre_ans)
print(ans)

Fixed submission:
ans=10**8
h,w,K=map(int,input().split())
s=[]
import copy
def two(x):
	return "0"*(h-1-len(bin(x)[2:]))+bin(x)[2:]
for i in range(h):
	s.append(input())
for i in range(2**(h-1)):
	r=two(i)
	pre_ans=r.count("1")
	d=[0]*(pre_ans+1)
	dd=copy.copy(d)
	cnt=0
	for j in range(w):
		now=0
		for k in range(h):
			if s[k][j]=="1":
				d[now]+=1
			if k!=h-1:
				if r[k]=="1":
					now+=1
		if max(d)>K:
			e=[]
			for x in range(len(d)):
				e.append(d[x]-dd[x])
			d=copy.copy(e)
			cnt+=1
		if max(d)>K:
			cnt=10**7
		dd=copy.copy(d)
	pre_ans+=cnt
	ans=min(ans,pre_ans)
print(ans)

Buggy python submission (verdict: Runtime Error):
ans=10**8
h,w,K=map(int,input().split())
s=[]
import copy
def two(x):
	return "0"*(h-1-len(bin(x)[2:]))+bin(x)[2:]
for i in range(h):
	s.append(input())
for i in range(2**(h-1)):
	r=two(i)
	pre_ans=r.count("1")
	d=[0]*(pre_ans+2)
	cnt=0
	for j in range(w):
		now=0
		for k in range(h):
			if s[k][j]=="1":
				d[now]+=1
			if k!=h-1:
				if r[k]=="1":
					now+=1
		if max(d)>K:
			e=[]
			for x in range(len(d)):
				e.append(d[x]-dd[x])
			d=copy.copy(e)
			cnt+=1
		if max(d)>K:
			pre_ans=10**7
			break
		dd=copy.copy(d)
	pre_ans+=cnt
	ans=min(ans,pre_ans)
print(ans)

Fixed submission:
ans=10**8
h,w,K=map(int,input().split())
s=[]
import copy
def two(x):
	return "0"*(h-1-len(bin(x)[2:]))+bin(x)[2:]
for i in range(h):
	s.append(input())
for i in range(2**(h-1)):
	r=two(i)
	pre_ans=r.count("1")
	d=[0]*(pre_ans+1)
	dd=copy.copy(d)
	cnt=0
	for j in range(w):
		now=0
		for k in range(h):
			if s[k][j]=="1":
				d[now]+=1
			if k!=h-1:
				if r[k]=="1":
					now+=1
		if max(d)>K:
			e=[]
			for x in range(len(d)):
				e.append(d[x]-dd[x])
			d=copy.copy(e)
			cnt+=1
		if max(d)>K:
			cnt=10**7
		dd=copy.copy(d)
	pre_ans+=cnt
	ans=min(ans,pre_ans)
print(ans)

Buggy python submission (verdict: Runtime Error):
ans=10**8
h,w,K=map(int,input().split())
s=[]
import copy
def two(x):
	return "0"*(h-1-len(bin(x)[2:]))+bin(x)[2:]
for i in range(h):
	s.append(input())
for i in range(2**(h-1)):
	r=two(i)
	pre_ans=r.count("1")
	d=[0]*(pre_ans+1)
	cnt=0
	for j in range(w):
		now=0
		for k in range(h):
			if s[k][j]=="1":
				d[now]+=1
			if k!=h-1:
				if r[k]=="1":
					now+=1
		if max(d)>K:
			e=[]
			for x in range(len(d)):
				e.append(d[x]-dd[x])
			d=copy.copy(e)
			cnt+=1
		if max(d)>K:
			pre_ans=10**7
			break
		dd=copy.copy(d)
	pre_ans+=cnt
	ans=min(ans,pre_ans)
print(ans)

Fixed submission:
ans=10**8
h,w,K=map(int,input().split())
s=[]
import copy
def two(x):
	return "0"*(h-1-len(bin(x)[2:]))+bin(x)[2:]
for i in range(h):
	s.append(input())
for i in range(2**(h-1)):
	r=two(i)
	pre_ans=r.count("1")
	d=[0]*(pre_ans+1)
	dd=copy.copy(d)
	cnt=0
	for j in range(w):
		now=0
		for k in range(h):
			if s[k][j]=="1":
				d[now]+=1
			if k!=h-1:
				if r[k]=="1":
					now+=1
		if max(d)>K:
			e=[]
			for x in range(len(d)):
				e.append(d[x]-dd[x])
			d=copy.copy(e)
			cnt+=1
		if max(d)>K:
			cnt=10**7
		dd=copy.copy(d)
	pre_ans+=cnt
	ans=min(ans,pre_ans)
print(ans)