def LAcum(L):
a=[]
s=0
for i in range(len(L)):
s += L[i]
a.append(s)
return a
def rangosLAcum(L,i,j):
L2=LAcum(L)
if not i:return L2(j)
return L2[j]-L2[i-1]
L=[1,2,3,4,5,6,7,8,9,10]
print(rangosLAcum(L,1,3))
ZGVmIExBY3VtKEwpOgoJYT1bXQoJcz0wCglmb3IgaSBpbiByYW5nZShsZW4oTCkpOgoJCXMgKz0gTFtpXQoJCWEuYXBwZW5kKHMpCglyZXR1cm4gYQoKZGVmIHJhbmdvc0xBY3VtKEwsaSxqKToKCUwyPUxBY3VtKEwpCglpZiBub3QgaTpyZXR1cm4gTDIoaikKCXJldHVybiBMMltqXS1MMltpLTFdCgkKCkw9WzEsMiwzLDQsNSw2LDcsOCw5LDEwXQoKcHJpbnQocmFuZ29zTEFjdW0oTCwxLDMpKQ==