Cod sursa(job #411487)

Utilizator AndreiDDiaconeasa Andrei AndreiD Data 4 martie 2010 22:12:12
Problema Al k-lea termen Fibonacci Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.69 kb
#include <cstdio>
#include <cstring>

#define file_in "kfib.in"
#define file_out "kfib.out"

#define Mod 666013

int n,a[2][2],b[2][2];

void mul(int a[2][2], int b[2][2])
{
	int i,j,k;
	int c[2][2];
	memset(c,0,sizeof(c));
	for (i=0;i<2;++i)
		 for (j=0;j<2;++j)
			  for (k=0;k<2;++k)
				   c[i][j]=(c[i][j]+a[i][k]*b[k][j])%Mod;
	memcpy(a,c,sizeof(c));
}	

int main()
{
	freopen(file_in,"r",stdin);
	freopen(file_out,"w",stdout);
	
	scanf("%d", &n);
	n--;
	
	a[0][0]=1;
	b[0][0]=1;
	b[1][0]=1;
	b[0][1]=1;
	
	while(n)
	{
		if (n%2==1)
			mul(a,b);
		mul(b,b);
		n>>=1;
	}
	
	printf("%d", a[0][0]);
	
	fclose(stdin);
	fclose(stdout);
	
	return 0;
	
}