#include <iostream>
#include <iomanip>
#include <sstream>
#include <unordered_set>
#include <vector>
#include <random>
/*
Generate unique HEX colors using randomness.
This produces different results each run, unlike deterministic HSL spacing.
Approach:
- Use std::random_device + std::mt19937 for strong randomness.
- Generate random R, G, B values.
- Convert to HEX (#RRGGBB).
- Store in an unordered_set to avoid duplicates.
*/
// Convert an integer (0–255) to a two-digit HEX string.
std::string toHex(int value) {
std::stringstream ss;
ss << std::hex << std::setw(2) << std::setfill('0') << value;
return ss.str();
}
// Generate N unique random HEX colors.
std::vector<std::string> generateRandomUniqueHexColors(std::size_t count) {
std::unordered_set<std::string> seen;
std::vector<std::string> colors;
colors.reserve(count);
std::random_device rd; // non-deterministic seed
std::mt19937 gen(rd()); // strong random engine
std::uniform_int_distribution<> dist(0, 255);
while (colors.size() < count) {
int r = dist(gen);
int g = dist(gen);
int b = dist(gen);
std::string hex = "#" + toHex(r) + toHex(g) + toHex(b);
if (seen.insert(hex).second) {
colors.push_back(hex);
}
}
return colors;
}
int main() {
std::size_t n = 12;
auto colors = generateRandomUniqueHexColors(n);
std::cout << "Generated HEX colors:\n";
for (const auto& c : colors) {
std::cout << c << "\n";
}
}
/*
run:
Generated HEX colors:
#61a8b0
#ac6739
#a22d16
#dc87cd
#e41e92
#8d080c
#623b60
#061887
#1dd3e6
#183f89
#b04076
#167187
*/
