Excel Sheet Alphabet to decimal Coversion
def get_max_sum(num)
if num < 1
return 0
else
return (26**num)+get_max_sum(num-1)
end
end
def cal_sum(st)
sum = get_max_sum(st.length - 1)
st.length.times do |i|
sum += (st[i]-97)*(26**(st.length-i-1))
end
return sum
end
p cal_sum('abc')