#include <random>
#include <vector>
#include <algorithm>
#include <iostream>
#include <iomanip>
 
int const width = 30;
int const samples = 50000;
double const stretch = 20.;
 
int main(int argc, char * argv[])
{
	std::mt19937 gen;
	std::normal_distribution<> dist(0.8, 0.2);
 
	std::vector<unsigned> hist(width);
 
	for(size_t i = 0; i < samples; ++i)
	{
		int v = dist(gen) * stretch;
		if(v > 0. && v < width)
			++hist[v];
	}
 
	int fakt = *std::max_element(hist.begin(), hist.end()) / width;
 
	for(size_t i = 0; i < width; ++i)
		std::cout << std::setw(4) << i / stretch << ": " << std::string(hist[i] / fakt, '*') << '\n';
}
 
 

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