#include <string>
#include <iostream>
#include <algorithm>
std::string convert(unsigned long value, unsigned long base) {
std::string rc;
do {
rc.push_back("0123456789abcde"[value % base]);
} while (value /= base);
std::reverse(rc.begin(), rc.end());
return rc;
}
int main() {
std::cout << convert(100, 16) << '\n';
std::cout << convert(100, 10) << '\n';
std::cout << convert(100, 2) << '\n';
std::cout << convert(100, 1) << '\n';
}
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