伪代码算法
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Set sum to 0
Read num 1
set sum to sum+num1
read num2
set sum to sum+num2
read num3
set sum to sum+num3
if(sum<0)
write "error"
else
write sum
Set sum to 0
Read num 1
set sum to sum+num1
read num2
set sum to sum+num2
read num3
set sum to sum+num3
if(sum<0)
write "error"
else
write sum