ProgramAlgTrain/20240906/bitset.cpp

#include <any>
#include <array>
#include <cstddef>
#include <iostream>
#include <ostream>
#include <vector>
using namespace std;

typedef unsigned int u8;
typedef int i8;

const u8 MAX = 1e5+1;


constexpr std::array<u8, (size_t)MAX> initLog2() {
    std::array<u8, (size_t)MAX> log2{};
    log2[1] = 0;
    for (int i = 2; i <= (int)MAX - 1; i++) {
        log2[i] = log2[i / 2] + 1;
    }
    return log2;
}

class BitIntSet {
private:
    constexpr static const std::array<u8, (size_t)MAX> log2 = initLog2();
public:
    i8 data;

    constexpr explicit BitIntSet(i8 n) : data{n} {}

    constexpr int getLowbit() const {
        return this->data & ((~this->data) + 1);
    }

    constexpr int getLowbit(u8 n) const {
        return n & ((~n) + 1);
    }

    constexpr std::vector<u8> get1Dir() const {
        std::vector<u8> ret;
        int temp = this->data;
        while (temp != 0) {
            // #ifndef NDEBUG
            //     std::cout<<std::format("[Debug]the lowbit of {} is {}\n",temp,getLowbit(temp));
            // #endif
            ret.push_back(log2[getLowbit(temp)]);
            temp -= getLowbit(temp);
        }
        return ret;
    }
};

auto getTypeName(std::any &a){
    return a.type().name();
}

template<class ...Args>
void print(const Args&...args){
    ((std::cout<<args),...);
}

template<typename... Args>
void println(const Args&...args){
    ((std::cout<<args<<" "),...);
    endl(std::cout);
}

int main() {
    int at =1;
    println(at,"b",123,"c");
    constexpr BitIntSet bit(257);
    constexpr auto a = bit.data,b=bit.getLowbit();
    auto c = bit.get1Dir();
    std::cout<<a<<" "<<b<<" "<<c[0]<<" "<<c[1]<<std::endl;
}