#include<stdio.h>
main()
{
/*   freopen("a.in","r",stdin);
   freopen("a.out","w",stdout);*/
   int a,b,k,state;
   long i,j;
   j = 0;
   k = 0;
   state=0;
   scanf("%ld",&i);
   scanf("%d%d",&a,&b);
   if(a+b>=10)
    {
      printf("1");
      k = a + b - 10;
      state=1;
     }
    else if(a + b == 9)
         j++;
      else
      {
      k = a + b;
      state = 1;
      }
    for(;i>1;i--)
      { scanf("%d%d",&a,&b);
    if(a + b >= 10)
      {
        printf("%d",k + 1);
        for(;j>0;j--)
           printf("0");
        k = a + b - 10;
        state = 1;
       }
     else if(a + b == 9)
          j++;
           else{ if(state)
            printf("%d",k);
             k = a + b;
             state = 1;
             for(;j>0;j--)
               printf("9");
             }
    }
    if(state)printf("%d",k);
    for(; j > 0;j--)
      printf("9");
/* fclose(stdin);
 fclose(stdout);*/
 }

> #include<stdio.h>
> main()
> {
> /*   freopen("a.in","r",stdin);
>    freopen("a.out","w",stdout);*/
>    int a,b,k,state;
>    long i,j;
>    j = 0;
>    k = 0;
>    state=0;
>    scanf("%ld",&i);
>    scanf("%d%d",&a,&b);
>    if(a+b>=10)
>     {
>       printf("1");
>       k = a + b - 10;
>       state=1;
>      }
>     else if(a + b == 9)
>          j++;
>       else
>       {
>       k = a + b;
>       state = 1;
>       }
>     for(;i>1;i--)
>       { scanf("%d%d",&a,&b);
>     if(a + b >= 10)
>       {
>         printf("%d",k + 1);
>         for(;j>0;j--)
>            printf("0");
>         k = a + b - 10;
>         state = 1;
>        }
>      else if(a + b == 9)
>           j++;
>            else{ if(state)
>             printf("%d",k);
>              k = a + b;
>              state = 1;
>              for(;j>0;j--)
>                printf("9");
>              }
>     }
>     if(state)printf("%d",k);
>     for(; j > 0;j--)
>       printf("9");
> /* fclose(stdin);
>  fclose(stdout);*/
>  }

It's the program for 1048 SUPERLONG SUM.