Cod sursa(job #3348128)

Utilizator nverde1119Popa Narcis Constantin nverde1119 Data 19 martie 2026 20:05:33
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.76 kb
#include <fstream>

using namespace std;
const int MOD = 666013;
ifstream f("kfib.in");
ofstream g("kfib.out");
int A[2][2] = {{1, 1}, {1, 0}};
int I[2][2] = {{1, 0}, {0, 1}};
void multmat(int a[][2], int b[][2]) ///a = a * b;
{
	long long c[2][2];
	int i, j, k;
	for(i = 0; i < 2; i++)
	{
		for(j = 0; j < 2; j++)
		{
			c[i][j] = 0;
			for(k = 0; k < 2; k++)
				c[i][j] += 1LL * a[i][k] * b[k][j];
		}
	}
	for(i = 0; i < 2; i++)
	{
		for(j = 0; j < 2; j++)
			a[i][j] = c[i][j] % MOD;
	}
}
void putermat(int p)
{
	while(p)
	{
		if(p % 2)
			multmat(I, A);
		multmat(A, A);
		p /= 2;
	}
}
int main()
{
	int k;
	f >> k;
	if(k <= 1)
		g << k;
	else
	{
		putermat(k - 1);
		g << I[0][0];
	}
	f.close();
	g.close();
	return 0;
}