【杂项】随机化

一个RAND()函数罢了

#include <stdio.h>
#include <time.h>
#include <cmath>
#include <stdlib.h>
//Brand;
namespace BIKUrand {
	template<typename Tec> 
	Tec Bquick_pow(Tec _a,Tec _n,Tec _p) {
		#define ull unsigned long long
		ull Bres = 1;
		ull _ia = _a, _in = _n, _ip = _p;
		while(_in) {
			if(_in&1) Bres = Bres*_ia%_ip;
			_ia = _ia*_ia%_ip;
			_in >>= 1;
		}
		#undef ull
		return (Tec)Bres;
	}
	template<typename Tec>
	Tec Bquick_pow(Tec _a,Tec _n) {
		#define ull unsigned long long
		ull Bres = 1;
		ull _ia = _a, _in = _n;
		while(_in) {
			if(_in&1) Bres = Bres*_ia;
			_ia = _ia*_ia;
			_in >>= 1;
		}
		#undef ull
		return (Tec)Bres;
	}
	bool Bcheck = false;
	void Bbegin() {
		if(Bcheck) return;
		Bcheck = true;
		srand(time(0));
	}
	int Bcount;
	template<typename Tec> 
	Tec B01make(Tec _aim) {
		if(rand()%(Tec)(sqrt(_aim)*sqrt(sqrt(_aim))*sqrt(sqrt(sqrt(_aim)))) == 0) 
			return rand()&1;
		else 
			return Bquick_pow((_aim-7),(Tec)rand(),_aim);
	}
	int Brand() {
		if(!Bcheck) 
			Bbegin();
		unsigned int Bbase = rand();
		unsigned int Bup = rand();
		return Bquick_pow(Bbase,Bup);
	}
	int Bbinrand() {
		if(!Bcheck) 
			Bbegin();
		int Bres = 0;
		int Bcnt = 0;
		while(Bcnt < 8*sizeof(int)) {
			Bres += (rand()%4)*(1<<Bcnt);
			Bcnt += 2;
		}
		return Bres;
	}
	template<typename Tec>
	Tec Brand(Tec _limit) {
		if(!Bcheck) 
			Bbegin();
		Tec Bbase = rand();
		Tec Bup = rand();
		Tec Bres = Bquick_pow(Bbase,Bup,_limit);
		return (Bres > 1) ? Bres : B01make(_limit);
	}
	template<typename Tec> 
	Tec Brand(Tec _left,Tec _right) {
		return Brand(_right-_left+1)+_left;
	}
} using namespace BIKUrand;