55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
#include <iostream>
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#include <fstream>
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void part1(std::ifstream& input, std::string& line) {
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int valid_count = 0;
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while (std::getline(input, line)) {
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size_t fp_i = line.find(' '); // Index of the first space in line
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size_t dash_i = line.find('-'); // Index of the only dash in line
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std::string password = line.substr(line.find(": ") + 2);
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char letter = line[fp_i + 1];
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int low = std::stoi(line.substr(0, dash_i));
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int high = std::stoi(line.substr(dash_i + 1, fp_i));
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int letter_count = std::count(password.cbegin(), password.cend(), letter);
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if (letter_count <= high && letter_count >= low) valid_count++;
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}
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std::cout << valid_count << std::endl;
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}
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void part2(std::ifstream& input, std::string& line) {
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int valid_count = 0;
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while(std::getline(input, line)) {
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size_t fp_i = line.find(' '); // Index of the first space in line
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size_t dash_i = line.find('-'); // Index of the only dash in line
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std::string password = line.substr(line.find(": ") + 2);
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char letter = line[fp_i + 1];
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size_t i1 = std::stoi(line.substr(0, dash_i)) - 1;
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size_t i2 = std::stoi(line.substr(dash_i + 1, fp_i)) - 1;
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if (password[i1] == password[i2]) continue; // If they are the same we can skip this line
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if (password[i1] == letter || password[i2] == letter) valid_count++;
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}
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std::cout << valid_count << std::endl;
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}
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int main() {
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std::ifstream input("../input.txt");
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std::string line;
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part1(input, line);
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input.clear(); // clear EOF flag
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input.seekg(0);
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part2(input, line);
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return 0;
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} |