Day 1

d1/main.cxx

@@ -0,0 +1,52 @@
+#include <numeric>
+#include <algorithm>
+#include <unordered_map>
+#include <map>
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <string>
+#include <vector>
+
+int main()
+{
+  std::ifstream file{"../d1/input.txt"};
+  std::string line, value;
+  std::vector<int> numbers;
+  std::unordered_map<std::string, char> letterMap{{"one", '1'},
+                                                  {"two", '2'},
+                                                  {"three", '3'},
+                                                  {"four", '4'},
+                                                  {"five", '5'},
+                                                  {"six", '6'},
+                                                  {"seven", '7'},
+                                                  {"eight", '8'},
+                                                  {"nine", '9'}};
+
+  while (std::getline(file, line))
+  {
+    std::map<int, char> lineNumbers;
+    for (const auto &entry : letterMap)
+    {
+      auto pos = line.find(entry.first);
+      while (pos != std::string::npos)
+      {
+        lineNumbers[pos] = entry.second;
+        pos = line.find(entry.first, pos + 1);
+      }
+    }
+    auto fstItr = std::find_if(line.begin(), line.end(), [](char c)
+                               { return isdigit(c); });
+    auto sndItr = std::find_if(line.rbegin(), line.rend(), [](char c)
+                               { return isdigit(c); });
+    if (fstItr != line.end())
+    {
+      lineNumbers[std::distance(line.begin(), fstItr)] = *fstItr;
+      lineNumbers[std::distance(line.rbegin(), sndItr)] = *sndItr;
+    }
+    numbers.emplace_back(std::stoi(std::string(1, lineNumbers.begin()->second) + lineNumbers.rbegin()->second));
+  }
+  std::cout << std::accumulate(numbers.begin(), numbers.end(), 0) << std::endl;
+
+  return 0;
+}