03.cpp

#include <chrono>
#include <iostream>
#include <string>

bool is_valid_triangle(int a, int b, int c) {
  return a + b > c && a + c > b && b + c > a;
}

int main() {
  auto tstart = std::chrono::high_resolution_clock::now();
  int pt1 = 0;
  int pt2 = 0;

  int a, b, c;
  std::string input;
  int window[3][3];
  int wi = 0;

  while (std::getline(std::cin, input)) {
    a = std::stoi(&input[0]);
    b = std::stoi(&input[5]);
    c = std::stoi(&input[10]);

    if (is_valid_triangle(a, b, c)) {
      pt1++;
    }

    window[0][wi] = a;
    window[1][wi] = b;
    window[2][wi] = c;

    // every 3 rows
    if (wi == 2) {
      for (int i = 0; i < 3; i++) {
        if (is_valid_triangle(window[i][0], window[i][1], window[i][2])) {
          pt2++;
        }
      }
      wi = 0;
    } else {
      wi++;
    }
  }

  std::cout << "--- Day 3: Squares With Three Sides ---\n";
  std::cout << "Part 1: " << pt1 << "\n";
  std::cout << "Part 2: " << pt2 << "\n";

  auto tstop = std::chrono::high_resolution_clock::now();
  auto duration =
      std::chrono::duration_cast<std::chrono::microseconds>(tstop - tstart);
  std::cout << "Time: " << duration.count() << " μs"
            << "\n";
  return EXIT_SUCCESS;
}