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// Standard C++
#include <array>
#include <fstream>
#include <iostream>
#include <string>
// Standard C
#include <cstdlib> // memcmp
// System
#include <md5.h>
using namespace std;
void
part1(string_view puzzle)
{
array<char, MD5_DIGEST_STRING_LENGTH> digest{};
string result;
string input;
for ( unsigned long counter = 0;; ++counter ) {
input = puzzle;
input += to_string(counter);
MD5Data(input.data(), input.size(), digest.data());
if ( memcmp(digest.data(), "00000", 5) == 0 ) {
result += digest.at(5);
if ( result.length() == 8 ) {
cout << result << endl;
return;
}
}
}
}
void
part2(string_view puzzle)
{
array<char, MD5_DIGEST_STRING_LENGTH> digest{};
string result = "________";
string input;
for ( unsigned long counter = 0;; ++counter ) {
input = puzzle;
input += to_string(counter);
MD5Data(input.data(), input.size(), digest.data());
if ( memcmp(digest.data(), "00000", 5) == 0 ) {
auto position = digest.at(5) - '0';
if ( position < 0 || position > 7 ) {
continue;
}
if ( result.at(size_t(position)) != '_' ) {
continue;
}
result.at(size_t(position)) = digest.at(6);
if ( result.find('_') == string::npos ) {
cout << result << endl;
return;
}
}
}
}
int
main()
{
auto puzzle = "reyedfim"s;
part1(puzzle);
part2(puzzle);
}
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