day4 part 1 done, part two wil kill me

day4/day.cpp

@@ -0,0 +1,149 @@
+
+#include <asm-generic/errno.h>
+#include <cstdlib>
+#include <errno.h>
+#include <fstream>
+#include <iostream>
+#include <vector>
+
+bool AreWeInBounds(int i, int j, std::vector<std::vector<char>> &wordsearch) {
+  if (i < 0 || j < 0) {
+    return false;
+  }
+  if (i >= wordsearch.size() || j >= wordsearch[i].size()) {
+    return false;
+  }
+  return true;
+}
+
+int conditional_operation(int a, int b, char op) {
+  switch (op) {
+  case '+':
+    return a + b;
+  case '-':
+    return a - b;
+  default:
+    return a;
+  }
+}
+
+int Check(std::vector<std::vector<char>> &wordsearch, int i, int j) {
+  int xmases = 0;
+  char op_i;
+  char op_j;
+
+  for (int w = 0; w < 8; w++) {
+    switch (w) {
+    case 0:
+      // search right
+      op_i = 'n';
+      op_j = '+';
+      if (!AreWeInBounds(i, j + 3, wordsearch)) {
+        continue;
+      }
+      break;
+    case 1:
+      // search left
+      op_i = 'n';
+      op_j = '-';
+      if (!AreWeInBounds(i, j - 3, wordsearch)) {
+        continue;
+      }
+      break;
+    case 2:
+      // search up
+      op_i = '-';
+      op_j = 'n';
+      if (!AreWeInBounds(i - 3, j, wordsearch)) {
+        continue;
+      }
+      break;
+    case 3:
+      // search down
+      op_i = '+';
+      op_j = 'n';
+      if (!AreWeInBounds(i + 3, j, wordsearch)) {
+        continue;
+      }
+      break;
+    case 4:
+      // search up-right
+      op_i = '-';
+      op_j = '+';
+      if (!AreWeInBounds(i - 3, j + 3, wordsearch)) {
+        continue;
+      }
+      break;
+    case 5:
+      // search up-left
+      op_i = '-';
+      op_j = '-';
+      if (!AreWeInBounds(i - 3, j - 3, wordsearch)) {
+        continue;
+      }
+      break;
+    case 6:
+      // search down-right
+      op_i = '+';
+      op_j = '+';
+      if (!AreWeInBounds(i + 3, j + 3, wordsearch)) {
+        continue;
+      }
+      break;
+    case 7:
+      // search down-left
+      op_i = '+';
+      op_j = '-';
+      if (!AreWeInBounds(i + 3, j - 3, wordsearch)) {
+        continue;
+      }
+      break;
+    default:
+      std::cerr << "How did we get here?" << std::endl;
+      exit(255);
+      break;
+    }
+    if (wordsearch[i][j] == 'X') {
+      if (wordsearch[conditional_operation(i, 1, op_i)]
+                    [conditional_operation(j, 1, op_j)] == 'M') {
+
+        if (wordsearch[conditional_operation(i, 2, op_i)]
+                      [conditional_operation(j, 2, op_j)] == 'A') {
+
+          if (wordsearch[conditional_operation(i, 3, op_i)]
+                        [conditional_operation(j, 3, op_j)] == 'S') {
+
+            xmases++;
+          }
+        }
+      }
+    }
+  }
+
+  return xmases;
+}
+
+int main() {
+  std::ifstream inputfile("input");
+  std::string input;
+
+  int res = 0;
+  if (!inputfile.is_open()) {
+    std::cerr << "Could not open the file" << std::endl;
+    return ENOENT;
+  }
+  std::string line;
+  std::vector<std::vector<char>> wordsearch;
+
+  while (std::getline(inputfile, line)) {
+    wordsearch.push_back(std::vector<char>(line.begin(), line.end()));
+  }
+  for (int i = 0; i < wordsearch.size(); i++) {
+    for (int j = 0; j < wordsearch[i].size(); j++) {
+      if (wordsearch[i][j] == 'X') {
+        res += Check(wordsearch, i, j);
+      }
+    }
+  }
+  std::cout << res << std::endl;
+}