Cod sursa(job #1841110)

Utilizator Andrei_CotorAndrei Cotor Andrei_Cotor Data 5 ianuarie 2017 12:53:30
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.04 kb
#include <cstdio>
#include <cstring>
#define mod 666013
using namespace std;
int N, i;
int MAT[3][3], SOL[3][3];

void mult(int A[][3], int B[][3], int C[][3])
{
    int i, j, k;
    for (i = 0; i < 2; i++)
        for (j = 0; j < 2; j++)
            for (k = 0; k < 2; k++)
                C[i][j] = (C[i][j] + 1LL * A[i][k] * B[k][j]) % mod;

}

void lg_power(int P, int M[][3])
{
    int C[3][3], AUX[3][3], i;
    memcpy(C, MAT, sizeof(MAT));
    M[0][0] = M[1][1] = 1;
    for (i = 0; (1 << i) <= P; i++) {
        if (P & (1 << i))
        {
            memset(AUX, 0, sizeof(AUX));
            mult(M, C, AUX);
            memcpy(M, AUX, sizeof(AUX));
        }
        memset(AUX, 0, sizeof(AUX));
        mult(C, C, AUX);
        memcpy(C, AUX, sizeof(C));
    }
}

int main()
{
    freopen("kfib.in", "r", stdin);
    freopen("kfib.out", "w", stdout);
    scanf("%d", &N);
    MAT[0][0] = 0; MAT[0][1] = 1; MAT[1][0] = 1; MAT[1][1] = 1;
    lg_power(N - 1, SOL);
    printf("%d\n", SOL[1][1]);
    return 0;
}