Project Euler 81

gistfile1.txt

file = open('matrix.txt','r').readlines()

array = []
for i in range (0,len(file)):
	line = file[i].split(',')
	array.append(line)

#adding algorithm works backward from next to last row to 0 row
for r in range (79,-1,-1):
	for s in range (79,-1,-1):
		if r == 79 and s < 79:
			array[r][s]=int(array[r][s])+int(array[r][s+1])
		if r == 79 and s == 79:
			array[r][s]=int(array[r][s])
		if r < 79 and s < 79:
			array[r][s]=int(array[r][s])+min(int(array[r+1][s]),int(array[r][s+1]))
		if r < 79 and s == 79:
			array[r][s]=int(array[r][s])+int(array[r+1][s])

print array[0][0]