Sum of Consecutive Prime Numbers UVA - 121

 

#include <iostream>
#include <cstring>
#include <cmath>
#include <algorithm>
using namespace std ; 

const int M =1e4+33;
 int b[M],c[M],tot;
 int s[M] ;
 
 void init(int top){
     memset(b,1,sizeof b); b[1]=0;
     int i,j;
     for(i=2;i<=top;i++){
         if(b[i]) c[++tot]=i;
         
        for(j=1;j<=tot&&i*c[j]<=top;j++){
             b[i*c[j]]=0;
             if(i%c[j]==0) break;
        } 
     }
 }
 
 signed main(){
 	init(1e4); 
 	int i,j,x;
 	for(i=1;i<=tot;i++) s[i]=s[i-1]+c[i];
 	
 	while(cin>>x,x){
 		int cnt=0;
	 	for(i=1;i<=tot;i++)
	 	 for(j=i;j<=tot;j++){
	 	 	if(s[j]-s[i-1]==x)  cnt++;  
	 	 }
	 	cout<<cnt<<endl;
 	} 
 }