count the 9!!
:-)

> count the 9!!
> :-)
Tell me more about it !!!! PLEASE !!!!

more hint :

0 1 -> 1 wait
2 3-> 5 wait print 1
3 4-> 7 wait print 5

0 1 ->1  wait
4 5 -> 9 #1 wait print 1
4 5 ->9 #2 wait
4 5 -> 9 #3  wait
2 2 ->4  <- now- print '9' for 3

0 1 ->1 ->print!
4 5 -> 9 #1 wait
4 5 ->9 #2 wait
4 5 -> 9 #3  wait
5 5 ->10  <- now- print '0' for 3

godd lucK :-)

(1)
0 1 -> 1 wait
2 3-> 5 wait print 1
3 4-> 7 wait print 5
.
.
(2)
0 1 ->1  wait
4 5 -> 9 #1 wait
4 5 ->9 #2 wait
4 5 -> 9 #3  wait
2 2 ->4  wait  <- now- printf '1' & print '9' for 3
.
.
(3)
0 1 ->1 wait
4 5 -> 9 #1 wait
4 5 ->9 #2 wait
4 5 -> 9 #3  wait
5 5 ->10  wait <- now- printf 1+1=2 & print '0' for 3
.
.
.
good lucK :-)

> (1)
> 0 1 -> 1 wait
> 2 3-> 5 wait print 1
> 3 4-> 7 wait print 5
> .
> .
> (2)
> 0 1 ->1  wait
> 4 5 -> 9 #1 wait
> 4 5 ->9 #2 wait
> 4 5 -> 9 #3  wait
> 2 2 ->4  wait  <- now- printf '1' & print '9' for 3
> .
> .
> (3)
> 0 1 ->1 wait
> 4 5 -> 9 #1 wait
> 4 5 ->9 #2 wait
> 4 5 -> 9 #3  wait
> 5 5 ->10  wait <- now- printf 1+1=2 & print '0' for 3
> .
> .
> .
> good lucK :-)
>
>

u can print  the sum of the number you're reading now when you've found
the sum after them !=9 if the sum after them ==9 just count it ......
1.when you've read the sum<9 print  all the number BEFORE  them then
start reading again and the last sum you've made become the firt one
2.when ugot sum>9 print the first one+! and all the nine-->0 the now the
first one is the last sum%10 got it? the main idea is u can stored the
number  in the way x 9 9 9 9 ..... but just remember the first one ans
COUNT the nine..........

sorry for my eng...

 Thank you !!!
If you want to make a  friend, mail me: Devil_hunter@mail.ru

but it may not work if the sum of every line is 9....

4 5 -> 9 wait
4 5 -> 9 #1wait
4 5 -> 9 #2wait
4 5 -> 9 #3wait
. . .  .    .
. . .  .    .
. . .  .    .
4 5-> 9 #999999wait
1 3-> than printf

if input just like this,how to solve it??

you count the nines and the zeroes. If current sum is larger than 10 you print the zeroes from the "buffer" otherwise you print the nines.
If you want a source code... nah, better not.

i did it according to your methods but still got WA even in the very first test1...ft...
but every test datas i could see are all made to be used into my local IDE and turned out to be correct...
why? i really dunno...ft...again...
any help would be appreciated as deeply as possible...

//here's my prog...
#include <iostream>
#include <vector>
using namespace std;

int main()
{
    long i,former,latter,n,c,count9=0;
    vector<long> a(0);
    cin>>n;
    for(i=0;i<2*n;i++)
    {
        cin>>c;
        a.push_back(c);
    }
    former=a[0]+a[1];
    for(i=0;i<2*n;i+=2)
    {
        latter=a[i+2]+a[i+3];
        if(n>=2)
        {
            if(latter<10)
            {
                if(latter==9)
                {
                       count9++;
                    if(i+3==2*n-1)
                    {
                        cout<<former;
                        while(count9--)
                           cout<<9;
                    }
                }
                else if(latter!=9&&count9==0)
                {
                    cout<<former;
                    former=latter;
                }
                else if(latter!=9&&count9>0)
                {
                    cout<<former;
                    while(count9--)
                       cout<<9;
                    cout<<latter;
                }
            }
            else
            {
                if(count9)
                {
                    cout<<former+1;
                    while(count9--)
                       cout<<0;
                    cout<<latter%10;
                }
                else
                {
                       cout<<former+1;
                    former=latter%10;
                }
        }
        }
        else
           cout<<former<<endl;
    }
    return 0;
}