Cod sursa(job #70234)

Utilizator a7893Nae Mihai a7893 Data 5 iulie 2007 11:14:38
Problema Loto Scor 10
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.37 kb
#include<stdio.h>
#include<stdlib.h>
#define N 1000001
int n,s,av[N],k1=1;
struct vec
{
	int i,j,k,s;
}v[N];
void read()
{
	int i;
	scanf("%d%d",&n,&s);
	for(i=1;i<=n;i++)
		scanf("%d",&av[i]);
}
int maxim(const void *a,const void *b)
{
	vec *aa,*bb;
	aa=(vec*)a;
	bb=(vec*)b;
	return aa->s-bb->s;
}
int binary_search(int val)  
{  
    int i, step;  
    for (step = 1; step <= k1; step <<= 1);  
    for (i = 0; step; step >>= 1)  
        if (i + step <= k1 && v[i + step].s <= val)  
           i += step;  
    return i;  
}  

void solve()
{
	int i,j,k,sol,mij;
	for(i=1;i<=n;++i)
		for(j=1;j<=n;++j)
			for(k=1;k<=n;++k)
			{
				v[k1].i=av[i];
				v[k1].j=av[j];
				v[k1].k=av[k];
				v[k1++].s=av[i]+av[j]+av[k];
			}
	k1--;		
	qsort(v,k1,sizeof(v[0]),maxim);
	for(i=1;i<=k1;++i)
	{
		sol=s-v[i].s;
		mij=binary_search(sol);
		if(v[mij].s==sol)
		{
			printf("%d %d %d %d %d %d\n",v[i].i,v[i].j,v[i].k,v[mij].i,v[mij].j,v[mij].k);
			return;
		}
		/*a=1;
		b=k1;
		while(a<=b)
		{
			mij=(a+b)/2;
			if(v[mij].s==sol)
			{
				printf("%d %d %d %d %d %d\n",v[i].i,v[i].j,v[i].k,v[mij].i,v[mij].j,v[mij].k);
				return;
			}
			if(sol<v[mij].s)
				b=mij-1;
			else
				a=mij+1;
		}*/
	}
	printf("-1\n");
}
int main()
{
	freopen("loto.in","r",stdin);
	freopen("loto.out","w",stdout);
	read();
	solve();
	return 0;
}