add 2022

1 files changed, 70 insertions, 0 deletions

diff --git a/Advent-of-Code-2022/aoc-2/main.c b/Advent-of-Code-2022/aoc-2/main.c
new file mode 100644
index 0000000..af65b88
--- /dev/null
+++ b/Advent-of-Code-2022/aoc-2/main.c
@@ -0,0 +1,70 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#if 0
+  #define PART part1
+#else
+  #define PART part2
+#endif
+
+#if 0
+  #define FILENAME "sample.txt"
+#else
+  #define FILENAME "input.txt"
+#endif
+
+// outcome[opponent][player]
+int outcome[3][3] = {
+       /* player rock paper scissors*/
+/* rock     */   { 1,   2,   0 },
+/* paper    */   { 0,   1,   2 },
+/* scissors */   { 2,   0,   1 },
+};
+
+// player[opponent][player]
+int player[3][3] = {
+              /* lose draw win */
+/* rock     */   { 2,  0,  1 },
+/* paper    */   { 0,  1,  2 },
+/* scissors */   { 1,  2,  0 },
+};
+
+int score = 0;
+
+void part1(char *line)
+{
+    int opponent = line[0] - 'A';
+    int player   = line[2] - 'X';
+
+    score += (player + 1) + (outcome[opponent][player] * 3);
+}
+
+void part2(char *line)
+{
+    int opponent = line[0] - 'A';
+    int outcome  = line[2] - 'X';
+
+    score += (player[opponent][outcome] + 1) + (outcome * 3);
+}
+
+void parse()
+{
+    FILE *fp = fopen(FILENAME, "r");
+    if(!fp) {
+        fprintf(stderr, "ERROR: Could not open file: %s\n", FILENAME);
+        exit(1);
+    }
+
+    char line[8];
+    while(fgets(line, sizeof(line), fp))
+        PART(line);
+
+    fclose(fp);
+}
+
+int main(void)
+{
+    parse();
+    printf("%d\n", score);
+    return 0;
+}