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| struct Mat {
static const int M = 2;
ll a[M][M];
Mat() { ms(a, 0); }
void clear() { ms(a, 0); }
void eye() { for (int i = 0; i < M; i++) a[i][i] = 1; }
ll* operator [] (ll x) { return a[x]; }
const ll* operator [] (ll x) const { return a[x]; }
Mat operator * (const Mat& b) {
const Mat& a = *this; Mat r;
for (int i = 0; i < M; i++)
for (int j = 0; j < M; j++)
for (int k = 0; k < M; k++)
r[i][j] = (r[i][j] + a[i][k] * b[k][j]) % mod;
return r;
}
Mat pow(ll n) const {
Mat a = *this, r; r.eye();
while (n > 0) {
if (n & 1) r = r * a;
n >>= 1; a = a * a;
}
return r;
}
Mat operator + (const Mat& b) {
const Mat& a = *this; Mat r;
for (int i = 0; i < M; i++)
for (int j = 0; j < M; j++)
r[i][j] = (a[i][j] + b[i][j]) % mod;
return r;
}
void print() const {
for (int i = 0; i < M; i++) for (int j = 0; j < M; j++)
printf("%lld%c", (*this)[i][j], j == M - 1 ? '\n' : ' ');
}
};
|