UVA 10943 - How do you add?

/******************************************************************
***   Problem       :                                           ***
***   Author        : Shipu Ahamed (Psycho Timekiller)          ***
***   E-mail        : [email protected]                   ***
***   University    : BUBT,Dept. of CSE                         ***
***   Team          : BUBT_Psycho                               ***
***   My Blog       : http://shipuahamed.blogspot.com           ***
***   Facebook      : http://www.facebook.com/DeesheharaShipu   ***
******************************************************************/

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;

#define pi 2*acos(0.0)
#define all(v) v.begin(),v.end()

//input
#define si(t) scanf("%d",&t)
#define sl(t) scanf("%I64d",&t)
#define sf(t) scanf("%f",&t)
#define sd(t) scanf("%lf",&t)
#define sc(c) scanf("%c",&c)
#define sii(a,b) scanf("%d%d",&a,&b)
#define sll(a,b) scanf("%I64d%I64d",&a,&b)

#define sfi(t) scanf("%d",&t)
#define sfii(a,b) scanf("%d %d",&a,&b)
#define sfiii(a,b,c) scanf("%d %d %d",&a,&b,&c)
#define sfll(t) scanf("%I64d",&t)
#define sfllll(a,b) scanf("%I64d %I64d",&a,&b)
#define sfllllll(a,b,c) scanf("%I64d %I64d %I64d",&a,&b,&c)
#define sfd(t) scanf("%lf",&t)
#define sfc(c) scanf("%c",&c)
#define sfs(s) scanf("%s",s)

//Output
#define P(a) printf("%d\n",a)
#define PL(a) printf("%I64d\n",a)
#define PF(a) printf("%f\n",a)
#define PDB(a) printf("%lf\n",a)
#define PN(a) printf("%d ",a)
#define PLN(a) printf("%I64d ",a)
#define PFN(a) printf("%f ",a)
#define PDBN(a) printf("%lf ",a)
#define PP(a,b) printf("%d %d\n",a,b)
#define PPN(a,b) printf("%d %d ",a,b)
#define PPL(a,b) printf("%I64d %I64d\n",a,b)
#define PPLN(a,b) printf("%I64d %I64d ",a,b)

#define pfi(a) printf("%d\n",a)
#define pfii(a,b) printf("%d %d\n",a,b)
#define pfiii(a,b,c) printf("%d %d %d\n",a,b,c)
#define pfll(a) printf("%I64d\n",a)
#define pfllll(a,b) printf("%I64d %I64d\n",a,b)
#define pfllllll(a,b,c) printf("%I64d %I64d %I64d\n",a,b,c)
#define pfd(a) printf("%lf\n",a)
#define pfs(a) printf("%s\n",a)
#define pfis(a) printf("%d ",a)
#define pflls(a) printf("%I64d ",a)
#define pfds(a) printf("%lf ",a)

#define CP(a) cout< pii;
typedef  pair piii;
typedef  pair pll;
typedef  pair psi;
typedef  vector vi;
typedef  vector vll;
typedef  vector vpii;
typedef  vector vs;
typedef  set si;
typedef  set ss;
typedef  map mii;
typedef  map mll;
typedef  map msi;

//Test Case & New line
#define Case(no) printf("Case %d: ",++no)
#define nl puts("")

//For Define
#define forab(i,a,b) for(__typeof(b) i=(a);i<=(b);i++)
#define for0(i,n) forab(i,0,(n)-1)
#define for1(i,n) forab(i,1,n)
#define rforba(i,b,a) for(__typeof(b) i=(b);i>=(a);i--)
#define rfor0(i,n) rforba(i,(n)-1,0)
#define rfor1(i,n) rforba(i,n,1)
#define forstl(i,s) for(__typeof((s).end()) i=(s).begin(); i != (s).end(); i++)

//Debug
#define dbg(x) cout << #x << " -> " << (x) << endl;
#define dbgsarr(i,a) cout<<#a<<"["< "< "< "<