# Python program to find all
# rectangles filled with 0
def findend1(p,q,a,output1,index1):
x = len(a)
y = len(a[0])
# Used the flag to check column edge case,
# initializing with 0
flagc1 = 0
# Used the flag to check row edge case,
# initializing with 0
flagr1 = 0
for m in range(p,x):
# Indicates loop breaks where first 1 encounters
if a[m][q] == 1:
flagr1 = 1 # Used to set the flag
break
# passing because already processed
if a[m][q] == 5:
pass
for n in range(q, y):
# Indicates loop breaks where first 1 encounters
if a[m][n] == 1:
flagc1 = 1 # setting the flag
break
# Used to fill rectangle elements with any
# number so that we can exclude
# next time
a[m][n] = 5
if flagr1 == 1:
output1[index1].append( m-1)
else:
#Used when end point touch the boundary
output1[index1].append(m)
if flagc1 == 1:
output1[index1].append(n-1)
else:
# Used when end point touch the boundary
output1[index1].append(n)
def get_rectangle_coordinates1(a):
# Used for retrieving the column size of array
size_of_array = len(a)
# Indicates output array where we are going
# to store our output
output1 = []
# It will be used for beginning
# and terminating location in the same index
index1 = -1
for p in range(0,size_of_array):
for q in range(0, len(a[0])):
if a[p][q] == 0:
# Used for storing initial position
# of rectangle
output1.append([p, q])
# Now will be used for the
# last position
index1 = index1 + 1
findend1(p, q, a, output1, index1)
print (output1)
# driver code
tests1 = [
[1, 0, 1, 1, 1, 0, 1],
[1, 1, 0, 1, 1, 1, 1],
[1, 1, 1, 0, 0, 1, 1],
[1, 0, 1, 1, 0, 0, 1],
[1, 0, 1, 1, 0, 1, 1],
[1, 0, 1, 0, 0, 0, 0],
[1, 1, 1, 0, 0, 0, 1],
[1, 0, 1, 1, 1, 0, 1]
]
get_rectangle_coordinates1(tests1)
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