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local scores = {"5","-2","4","C","D","9","+","+"}
function Final_score(x)
local score = 0
local prev = {}
local res = {}
for i=1,#x do
if (tonumber(x[i])) then
table.insert(prev,x[i])
table.insert(res,x[i])
elseif scores[i]=="C" then
table.remove(prev)
table.remove(res)
elseif scores[i]=="D" then -- double previous score
local last = prev[#prev]
table.insert(res,last*2)
table.insert(prev,last*2)
elseif scores[i]=="+" then -- add last two scores
local last = prev[#prev]
local last2 = prev[#prev-1]
table.insert(res,last+last2)
table.insert(prev,last+last2)
end
end
for _,v in ipairs(res) do
print(v)
score= score + v
end
print("score ", score)
end
Final_score(scores)
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