adventofcode2023/day01.cpp at main · pmadridb/adventofcode2023 · GitHub

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#include <fstream>
#include <string>
#include <iostream>

std::vector<std::string> readFile()
{
    std::ifstream file("inputsmall.txt");
    std::string str;
    std::vector<std::string> lines;
    while (std::getline(file, str))
    {
        lines.push_back(str);
    }
    return lines;
}

void part1()
{
    std::vector<std::string> lines = readFile();
    int total = 0;
    for (int i = 0; i < lines.size(); i++)
    {
        std::string line = lines[i];
        std::string firstDigit;
        for (int j = 0; j < line.size(); j++)
        {
            if (isdigit(line[j]))
            {
                firstDigit = line[j];
                break;
            }
        }
        std::string lastDigit;
        for (int j = line.size()-1; j >= 0; j--)
        {
            if (isdigit(line[j]))
            {
                lastDigit = line[j];
                break;
            }
        }
        std::string value = firstDigit + lastDigit;
        total = total + stoi(value);
    }
    std::cout << total;
}

void replace(std::string& str, const std::string& from, const std::string& to) {
    size_t start_pos = 0;
    while((start_pos = str.find(from, start_pos)) != std::string::npos) {
        str.replace(start_pos, from.length(), to);
        start_pos += to.length();
    }
}

void replaceDigits(std::string& line) {
    replace(line, "one", "1");
    replace(line, "two", "2");
    replace(line, "three", "3");
    replace(line, "four", "4");
    replace(line, "five", "5");
    replace(line, "six", "6");
    replace(line, "seven", "7");
    replace(line, "eight", "8");
    replace(line, "nine", "9");
}

void part2()
{
    std::vector<std::string> lines = readFile();
    int total = 0;
    for (int i = 0; i < lines.size(); i++)
    {
        std::string line = lines[i];
        replaceDigits(line);
        std::string firstDigit;
        for (int j = 0; j < line.size(); j++)
        {
            if (isdigit(line[j]))
            {
                firstDigit = line[j];
                break;
            }
        }
        std::string lastDigit;
        for (int j = line.size()-1; j >= 0; j--)
        {
            if (isdigit(line[j]))
            {
                lastDigit = line[j];
                break;
            }
        }
        std::string value = firstDigit + lastDigit;
        total = total + stoi(value);
    }
    std::cout << "part2: ";
    std::cout << total;
}

int main()
{
    // part1();
    part2();
    return EXIT_SUCCESS;
}