CF718C Sasha and Array [线段树+矩阵]

我们考虑线性代数上面的矩阵知识

啊呸，是基础数学

斐波那契的矩阵就不讲了

定义矩阵 (f_x) 是第 (x) 项的斐波那契矩阵

因为
(f_i * f_j = f_{i+j})

然后又因为 ( exttt{AB+AC=A(B+C)})

所以 (sum_{i=l}^{r} f(a_i+x) = f(x)sum_{i=l}^{r} f(a_i))

线段树板子题，维护一个矩阵，这题没了

// by Isaunoya
#include <bits/stdc++.h>
using namespace std;

#define rep(i, x, y) for (register int i = (x); i <= (y); ++i)
#define Rep(i, x, y) for (register int i = (x); i >= (y); --i)
#define int long long

const int _ = 1 << 21;
struct I {
	char fin[_], *p1 = fin, *p2 = fin;
	inline char gc() {
		return (p1 == p2) && (p2 = (p1 = fin) + fread(fin, 1, _, stdin), p1 == p2) ? EOF : *p1++;
	}
	inline I& operator>>(int& x) {
		bool sign = 1;
		char c = 0;
		while (c < 48) ((c = gc()) == 45) && (sign = 0);
		x = (c & 15);
		while ((c = gc()) > 47) x = (x << 1) + (x << 3) + (c & 15);
		x = sign ? x : -x;
		return *this;
	}
	inline I& operator>>(double& x) {
		bool sign = 1;
		char c = 0;
		while (c < 48) ((c = gc()) == 45) && (sign = 0);
		x = (c - 48);
		while ((c = gc()) > 47) x = x * 10 + (c - 48);
		if (c == '.') {
			double d = 1.0;
			while ((c = gc()) > 47) d = d * 0.1, x = x + (d * (c - 48));
		}
		x = sign ? x : -x;
		return *this;
	}
	inline I& operator>>(char& x) {
		do
			x = gc();
		while (isspace(x));
		return *this;
	}
	inline I& operator>>(string& s) {
		s = "";
		char c = gc();
		while (isspace(c)) c = gc();
		while (!isspace(c) && c != EOF) s += c, c = gc();
		return *this;
	}
} in;
struct O {
	char st[100], fout[_];
	signed stk = 0, top = 0;
	inline void flush() {
		fwrite(fout, 1, top, stdout), fflush(stdout), top = 0;
	}
	inline O& operator<<(int x) {
		if (top > (1 << 20)) flush();
		if (x < 0) fout[top++] = 45, x = -x;
		do
			st[++stk] = x % 10 ^ 48, x /= 10;
		while (x);
		while (stk) fout[top++] = st[stk--];
		return *this;
	}
	inline O& operator<<(char x) {
		fout[top++] = x;
		return *this;
	}
	inline O& operator<<(string s) {
		if (top > (1 << 20)) flush();
		for (char x : s) fout[top++] = x;
		return *this;
	}
} out;
#define pb emplace_back
#define fir first
#define sec second

template < class T > inline void cmax(T & x , const T & y) {
	(x < y) && (x = y) ;
}
template < class T > inline void cmin(T & x , const T & y) {
	(x > y) && (x = y) ;
}

const int mod = 1e9 + 7 ;
const int maxn = 1e5 + 51 ;
struct matrix {
	int a[3][3] ;
	matrix () {
		rep(i , 1 , 2) rep(j , 1 , 2) a[i][j] = 0 ;
	}
	void clr() {
		rep(i , 1 , 2) rep(j , 1 , 2) a[i][j] = 0 ;
		rep(i , 1 , 2) a[i][i] = 1 ;
	}
	bool empty() {
		if(a[1][1] ^ 1) return false ;
		if(a[1][2] || a[2][1]) return false ;
		if(a[2][2] ^ 1) return false ;
		return true ;
	}
	matrix operator * (const matrix & other) const {
		matrix res ;
		rep(i , 1 , 2) rep(j , 1 , 2) {
			res.a[i][j] = 0 ;
			rep(k , 1 , 2) res.a[i][j] = (res.a[i][j] + a[i][k] * other.a[k][j]) % mod ;
		}
		return res ;
	}
	matrix operator + (const matrix & other) const {
		matrix res ;
		rep(i , 1 , 2) rep(j , 1 , 2) res.a[i][j] = (a[i][j] + other.a[i][j] >= mod) ? a[i][j] + other.a[i][j] - mod : a[i][j] + other.a[i][j] ;
		return res ; 
	}
} ;
matrix qwq ;
matrix qpow(matrix a , int k) {
	matrix res = a ; -- k ;
	for( ; k ; a = a * a , k >>= 1)
		if(k & 1) res = res * a ;
	return res ;
}
int n , m ;
int a[maxn] ;
matrix s[maxn << 2] , tag[maxn << 2] ;
void build(int l , int r , int o) {
	tag[o].clr() ;
	if(l == r) {
		s[o] = qpow(qwq , a[l]) ;
		return ;
	}
	int mid = l + r >> 1 ;
	build(l , mid , o << 1) ;
	build(mid + 1 , r , o << 1 | 1) ;
	s[o] = s[o << 1] + s[o << 1 | 1] ;
}
void psd(int o) {
	if(tag[o].empty()) return ;
	tag[o << 1] = tag[o << 1] * tag[o] ;
	tag[o << 1 | 1] = tag[o << 1 | 1] * tag[o] ;
	s[o << 1] = s[o << 1] * tag[o] ;
	s[o << 1 | 1] = s[o << 1 | 1] * tag[o] ;
	tag[o].clr() ;
}
void upd(int a , int b , int l , int r , matrix x , int o) {
	if(a <= l && r <= b) {
		s[o] = s[o] * x ;
		tag[o] = tag[o] * x ;
		return ;
	}
	psd(o) ;
	int mid = l + r >> 1 ;
	if(a <= mid) upd(a , b , l , mid , x , o << 1) ;
	if(b > mid) upd(a , b , mid + 1 , r , x , o << 1 | 1) ;
	s[o] = s[o << 1] + s[o << 1 | 1] ;
}
matrix qry(int a , int b , int l , int r , int o) {
	if(a <= l && r <= b) {
		return s[o] ;
	} psd(o) ;
	int mid = l + r >> 1 ;
	matrix res ;
	if(a <= mid) res = res + qry(a , b , l , mid , o << 1) ;
	if(b > mid) res = res + qry(a , b , mid + 1 , r , o << 1 | 1) ;
	return res ;
}
signed main() {
#ifdef _WIN64
	freopen("testdata.in" , "r" , stdin) ;
#endif
	qwq.a[1][1] = qwq.a[1][2] = qwq.a[2][1] = 1 ;
	qwq.a[2][2] = 0 ;
	in >> n >> m ;
	rep(i , 1 , n) in >> a[i] ;
	build(1 , n , 1) ;
	while(m --) {
		int opt ;
		in >> opt ;
		if(opt == 1) {
			int l , r , v ;
			in >> l >> r >> v ;
			upd(l , r , 1 , n , qpow(qwq , v) , 1) ;
		}
		else {
			int l , r ;
			in >> l >> r ;
			out << qry(l , r , 1 , n , 1).a[1][2] << '
' ;
		}
	}
	return out.flush(), 0;
}