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deleted 22 characters in body

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edited Feb 28, 2022 at 0:45

Python3, 116102 bytes:

lambda x,c=0:min([i for i in range(lenv(x),c)ifand vc)or(x,i)]+[len and f(x,c+1)])
v=lambda x,i:len(x)<=i or(sum(x[:i])==x[i]and v(x[1:],i))

lambda x:min([i for i in range(len(x))if v(x,i)]+[len(x)])
v=lambda x,i:len(x)<=i or(sum(x[:i])==x[i]and v(x[1:],i))

lambda x,c=0:(v(x,c)and c)or(x and f(x,c+1))
v=lambda x,i:len(x)<=i or(sum(x[:i])==x[i]and v(x[1:],i))

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created Feb 28, 2022 at 0:24

lambda x:min([i for i in range(len(x))if v(x,i)]+[len(x)])
v=lambda x,i:len(x)<=i or(sum(x[:i])==x[i]and v(x[1:],i))