add 2022

1 files changed, 75 insertions, 0 deletions

diff --git a/Advent-of-Code-2022/aoc-1/main.c b/Advent-of-Code-2022/aoc-1/main.c
new file mode 100644
index 0000000..7cb961e
--- /dev/null
+++ b/Advent-of-Code-2022/aoc-1/main.c
@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#if 0
+  #define FILENAME "sample.txt"
+#else
+  #define FILENAME "input.txt"
+#endif
+
+int biggest[3];
+
+int bigger(int val)
+{
+    for(int i = 2; i >= 0; i--)
+        if(val > biggest[i]) return i;
+    return -1;
+}
+
+void shift(int n, int val)
+{
+    for(int i = 1; i <= n; i++)
+        biggest[i-1] = biggest[i];
+
+    biggest[n] = val;
+}
+
+void check(int val)
+{
+    int b = bigger(val);
+    if(b != -1)
+        shift(b, val);
+}
+
+void parse()
+{
+    FILE *fp = fopen(FILENAME, "r");
+    if(!fp) {
+        fprintf(stderr, "ERROR: Could not open file %s\n", FILENAME);
+        exit(1);
+    }
+
+    char line[256];
+    int sum = 0;
+    while(fgets(line, sizeof(line), fp) != NULL)
+    {
+        if(line[0] == '\n') {
+            check(sum);
+            sum = 0;
+        }
+
+        sum += atoi(line);
+    }
+    check(sum); // the file does not end in a newline
+
+    fclose(fp);
+}
+
+int main(void)
+{
+    for(int i = 0; i < 3; i++)
+        biggest[i] = INT_MIN;
+
+    parse();
+
+    int sum = 0;
+    for(int i = 0; i < 3; i++) {
+        printf("%d\n", biggest[i]);
+        sum += biggest[i];
+    }
+
+    printf("\n%d\n", sum);
+
+    return 0;
+}