hdu2110-Crisis of HDU

 
#include<map>  
#include<set>  
#include<list>  
#include<cmath>  
#include<ctime>  
#include<deque>  
#include<stack>  
#include<bitset>  
#include<cstdio>  
#include<vector>  
#include<cstdlib>  
#include<cstring>  
#include<iomanip>  
#include<numeric>  
#include<sstream>  
#include<utility>  
#include<iostream>  
#include<algorithm>  
#include<functional>  
  
using namespace std ;  
const int maxn = 10005 ;  
int n , num[ maxn ] , value[ maxn ] , sum , a[ maxn ] , b[ maxn ] ;  
  
int main()  
{  
    while( scanf( "%d" , &n ) != EOF && n )  
    {  
        sum = 0 ;  
        for( int i = 1 ; i <= n ; ++i )  
        {  
            scanf( "%d%d" , &value[ i ] , &num[ i ] ) ;  
            sum += value[ i ] * num[ i ] ;   
        }  
        if( sum % 3 != 0 )  
        {  
            printf( "sorry\n" ) ;  
            continue ;  
        }  
        memset( a , 0 , sizeof( a ) ) ;  
        memset( b , 0 , sizeof( b ) ) ;  
        a[ 0 ] = 1 ;   
        for( int i = 1 ; i <= n ; ++i )  
        {  
            for( int j = 0 ; j <= sum ; ++j )  
            {  
                for( int k = 0 ; k <= num[ i ] && k * value[ i ] + j <= sum ; ++k )  
                {  
                    b[ k * value[ i ] + j ] +=  a[ j ] ;  
                    b[ k * value[ i ] + j ] %= 10000 ;  
                }  
            }  
            for( int j = 0 ; j < sum ; ++j )  
            {  
                a[ j ] = b[ j ] ;   
                b[ j ] = 0 ;   
            }  
        }         
        if( a[ sum / 3 ] == 0 )  
            printf( "sorry\n" ) ;  
        else  
            printf( "%d\n" , a[ sum / 3 ] ) ;  
    }  
    return 0;  
}