Cod sursa(job #80574)

Utilizator MarcvsHdrMihai Leonte MarcvsHdr Data 28 august 2007 17:48:26
Problema Triplete Scor 90
Compilator cpp Status done
Runda Arhiva de probleme Marime 1 kb
# include <stdio.h>

const long int NRBITI=30;
const long int MAXN=4096/NRBITI;
const long int MAXX=4096;
const long int MAXMUC=100000;

struct {long int aa,bb;} muc[MAXMUC+1];

long int a[MAXX+4][MAXN+4],n,m;
long long int sol;

long int nrbiti(long int a)
{
long int sol=0;
while (a)
	{
	sol++;
	a=a&(a-1);
	}
return sol;
}

void add(long int loc,long int inf)
{
long int adaos=0;
if (inf%NRBITI==0) adaos=1;
a[loc][inf/NRBITI+1-adaos]|=(long int)1<<(inf%NRBITI);
}

void citire()
{
long int aa,bb;
FILE *f=fopen("triplete.in","r");
fscanf(f,"%ld%ld",&n,&m);
long int i;
for (i=1;i<=m;i++)
	{
	fscanf(f,"%ld%ld",&aa,&bb);
	muc[i].aa=aa;
	muc[i].bb=bb;
	add(aa,bb);
	add(bb,aa);
	}
fclose(f);
}

void calculeaza()
{
long int i,aa,bb,j;
for (i=1;i<=m;i++)
	for (j=1;j<=n/NRBITI+1;j++)
		sol+=nrbiti(a[muc[i].aa][j]&a[muc[i].bb][j]);
FILE *g=fopen("triplete.out","w");
fprintf(g,"%lld\n",sol/3);
fcloseall();
}

int main()
{
citire();
calculeaza();
return 0;
}