Initial Commit - days 01-12

day05/ex1-c.c

@@ -0,0 +1,35 @@
+/* ex1-c: Advent2020 game, day 4/game 1
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int str2int(str)
+    char *str;
+{
+    int res=0;
+    while (*str) {
+        res <<= 1;
+        if (*str == 'B' || *str == 'R')
+            res ^= 1;
+        str++;
+    }
+    return res;
+}
+
+int main(ac, av)
+    char **av;
+{
+    int max=0, cur, count=0;
+    char rowstr[80], colstr[80], line[80];
+
+    while (fgets(line, sizeof line, stdin)) {
+        count++;
+        sscanf(line, "%[FB]%[RL]", rowstr, colstr);
+        cur=(str2int(rowstr)<<3) ^ str2int(colstr);
+        if (cur > max)
+            max=cur;
+    }
+    printf("%s : lines=%d max=%d\n", *av, count, max);
+    exit (0);
+}