4 files changed, 62 insertions(+), 0 deletions(-)

A day02/.gitignore
A day02/Makefile
A day02/day02.c
A day02/day02.test

@@ 0,0 1,1 @@
+day02

@@ 0,0 1,6 @@
+CFLAGS += -std=c11 -Os
+
+day02: day02.o
+
+clean:
+	$(RM) day02 day02.o

@@ 0,0 1,52 @@
+/*
+ * day02.c
+ * Copyright (C) 2022 Adrian Perez de Castro <aperez@igalia.com>
+ *
+ * Distributed under terms of the MIT license.
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+enum Fig {
+    Rock = 1,
+    Paper = 2,
+    Scissors = 3,
+};
+
+static bool
+fig_wins(enum Fig a, enum Fig b)
+{
+    return (a == Rock && b == Scissors)
+        || (a == Paper && b == Rock)
+        || (a == Scissors && b == Paper);
+}
+
+int
+main(int argc, char *argv[])
+{
+    char other;
+    char ours;
+
+    unsigned score = 0;
+
+    while (!feof(stdin) && scanf("%c %c\n", &other, &ours) == 2) {
+        assert(other >= 'A' && other <= 'C');
+        assert(ours >= 'X' && ours <= 'Z');
+
+        const enum Fig fother = other - 'A' + 1;
+        const enum Fig fours = ours - 'X' + 1;
+
+        if (fig_wins(fours, fother)) {
+            score += fours + 6;
+        } else if (fother == fours) {
+            score += fours + 3;
+        } else {
+            score += fours + 0;
+        }
+    }
+    printf("%u\n", score);
+
+    return 0;
+}

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