random 生成随机数

#include <random>
#include <vector>

//生成随机整数，均匀分布在闭区间[beg,end]
std::vector<int> GenRandomInt(int rand_num,int beg,int end) {
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_int_distribution<> dis(beg,end);

    std::vector<int> v;
    for(int i=0;i<rand_num;i++) {
        v.push_back(dis(gen));
    }

    return v;
}

//生成随机浮点数，均匀分布在闭区间[beg,end]
std::vector<double> GenRandomDouble(int rand_num,int beg,int end) {
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_real_distribution<> dis(beg,end);

    std::vector<double> v;
    for(int i=0;i<rand_num;i++) {
        v.push_back(dis(gen));
    }

    return v;
}

//生成随机浮点数，均匀分布在半闭半开区间[0,1)
std::vector<double> GenRandomDecimal(int rand_num) {
    std::random_device rd;
    std::mt19937 gen(rd());

    std::vector<double> v;
    for(int i=0;i<rand_num;i++) {
        v.push_back(std::generate_canonical<double,10>(gen));
    }

    return v;
}