Advent of Code 2017

advent_of_code_2017.md

My solutions to http://adventofcode.com/2017

day01.cpp

#include <string>
#include <iostream>
using namespace std;

// const string INPUT = "1122";
// const string INPUT = "1111";
// const string INPUT = "1234";
const string INPUT = "91212129";

int main () {
  int sum = 0;
  int next = 0;

  for (int i = 0; i < INPUT.length(); i++) {
    next = i == INPUT.length() - 1 ? 0 : i + 1;
    if (INPUT[i] == INPUT[next]) {
      sum += (int)INPUT[i] - 48;
    }
  }

  cout << "The sum of the digits that match their successor (looping) is " << sum << endl;

  return 0;
}

day02.cpp

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

using namespace std;

int main () {
  ifstream inputFile;
  string currLine;
  int min;
  int max;
  int curr;
  int sum = 0;

  inputFile.open("day_2.txt");

  while (std::getline(inputFile, currLine)) {
    int min = INT_MAX;
    int max = INT_MIN;
    int curr;
    istringstream cl(currLine);
    while (cl >> curr) {
      if (curr < min) min = curr;
      if (curr > max) max = curr;
    }
    sum += (max - min);
  }
  inputFile.close();
  cout << "The sum is " << sum << endl;

  return 0;
}