Project Euler problem#15
#python program to find the lattice path of 20x20 grid
a=[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
for j in range(1,21):
i=1
while i <21 :
a[i] = int(a[i-1])+int(a[i])
i+=1
print (a[20])
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