Submission #202846

#	Time	Username	Problem	Language	Result	Execution time	Memory
202846		coloredrabbit	Phibonacci (kriii2_P)	C++17	1 / 4	6 ms	380 KiB

P

#include<iostream>
#include<cstring>
using namespace std;
using ll = __int128;
const int LIMIT = 126, M = 1e9 + 7;
const ll MOD = (long long)M * M;
struct _mt {
	ll m[2][2], t[2][2];
	_mt() {
		memset(m, 0, sizeof m); 
		memset(t, 0, sizeof t); 
	}
	void E() { for (int i = 0; i < 2; i++) t[i][i] = m[i][i] = 1; }
	_mt operator*(const _mt& o) {
		_mt r;
		int i, j, k;
		for (i = 0; i < 2; i++)for (j = 0; j < 2; j++) for (k = 0; k < 2; k++) {
			r.m[i][j] = (r.m[i][j] + m[i][k] * o.m[k][j]) % M;
			r.t[i][j] = (r.t[i][j] + t[i][k] * o.t[k][j]) % MOD;
		}
		return r;
	}
}F[LIMIT], NK, K;
ll _pow(ll a, ll n) {
	if (n == 1) return a;
	ll h = _pow(a, n >> 1);
	return (h * h % M) * (n % 2 ? a : 1) % M;
}
int main() {
	ll n, k, A, B, i, nk, bitset_v = 1, x, y;
	long long tN, tK;
	cin >> tN >> tK;
	n = tN, k = tK;
	F[0].m[0][0] = F[0].m[0][1] = F[0].m[1][0] = 1;
	NK.E(); K.E();
	nk = k * n;
	for (i = 1; i < LIMIT; i++) F[i] = F[i - 1] * F[i - 1];
	for (i = 0; i < LIMIT; i++) {
		if ((bitset_v << i) & nk) NK = NK * F[i];
		if ((bitset_v << i) & k) K = K * F[i];
	}
	if(K.m[0][1]){
		x = K.m[0][1];
		y = NK.m[0][1];
	} else {
		x = K.t[0][1];
		y = NK.t[0][1];
	}
	
	A = NK.m[0][1] * _pow(x, M - 2) % M;
	B = (NK.m[1][1] - A * K.m[1][1] % M + M) % M;
	cout << (long long)A << ' ' << (long long)B;
	return 0;
}

Compilation message (stderr)

P.cpp: In function 'int main()':
P.cpp:30:41: warning: variable 'y' set but not used [-Wunused-but-set-variable]
  ll n, k, A, B, i, nk, bitset_v = 1, x, y;
                                         ^

• Subtask 1: 1 / 1
• Subtask 2: 0 / 3