Upload day02

README.md

@@ -5,7 +5,7 @@ These are my attempts on [AoC 2022](https://adventofcode.com/2022/)
 | Day          | Part 1 | Part 2 | Language |
 |--------------|--------|--------|----------|
 | [01](day01)  |   ⭐   |   ⭐   | Python   |
-| 02           |        |        |          |
+| [02](day02)  |   ⭐   |   ⭐   | C        |
 | 03           |        |        |          |
 | 04           |        |        |          |
 | 05           |        |        |          |

day02/input_demo.txt

@@ -0,0 +1,3 @@
+A Y
+B X
+C Z

day02/solution.c

@@ -0,0 +1,81 @@
+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+  if (argc != 2) {
+    printf("Usage: %s <input filename>", argv[0]);
+    return 1;
+  }
+
+  FILE *fp = fopen(argv[1], "r");
+  if (fp == NULL) {
+    printf("Could not open file %s", argv[1]);
+    return 1;
+  }
+
+  // Each line looks like this:
+  // A X
+  // One byte Action, one space, one byte Reaction
+ 
+  int score_1 =  0;
+  int score_2 =  0;
+
+  char line[5];
+
+  while (fgets(line, sizeof(line), fp)) {
+
+    char action = line[0] - 'A'; // Map A-C to 0-2
+    char reaction = line[2] - 'X'; // Map X-Z to 0-2
+
+    // Points for reaction
+    score_1 += reaction + 1;
+
+    // Points for win/draw/lose
+    int points[] = {3,6,0}; // tie, win, lsoe
+    score_1 += points[(reaction - action + 3) % 3];
+    
+    // Part 2
+    char winstate = reaction;
+
+    score_2 += winstate*3;
+    score_2 += (action + (winstate+2)) % 3 + 1;
+
+  }
+
+  fclose(fp);
+
+  printf("Part 1 Score: %d\n", score_1);
+  printf("Part 2 Score: %d\n", score_2);
+  return 0;
+}
+
+
+/* int simplifiedSolution(char action, char reaction) { */
+/*   int score_1 = 0; */
+/*   int score_2 = 0; */
+
+/*   score_1 += reaction + 1; */
+/*   if ((reaction - action + 3) % 3 == 1) { */
+/*     // Win */
+/*     score_1 += 6; */
+/*   } else if (action == reaction) { */
+/*     // Draw */
+/*     score_1 += 3; */
+/*   } else { */
+/*     // Lose */
+/*   } */
+
+/*   if (winstate == 0) { */
+/*     // Need to lose */
+/*     score_2 += 0; */
+/*     score_2 += (action+2) % 3; */
+/*   } else if (winstate == 1) { */
+/*     // Need to draw */
+/*     score_2 += 3; */
+/*     score_2 += action; */
+/*   } else { */
+/*     // Need to win */
+/*     score_2 += 6; */
+/*     score_2 += ((action+1) % 3); */
+/*   } */
+/*   score_2 += 1; // Because of zero indexing */
+/* } */

day02/testcases.txt

@@ -0,0 +1,9 @@
+A X
+A Y
+A Z
+B X
+B Y
+B Z
+C X
+C Y
+C Z