init

2022/day3/p2/day3p2.c

@@ -0,0 +1,135 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+
+int CountLines(char *FileName)
+{
+    char *Line = malloc(256);
+    int LineCount = 0;
+
+    FILE *File;
+    File = fopen(FileName, "r");
+
+    while (fgets(Line, 256, File) != NULL)
+    {
+        LineCount++;
+    }
+
+    fclose(File);
+
+    return LineCount;
+}
+
+
+void GetLine(char *FileName, int LineNumber, char* Line)
+{
+    int CurrentLineNumber = 1;
+
+    FILE *File;
+    File = fopen(FileName, "r");
+
+    while (fgets(Line, 256, File) != NULL)
+    {
+
+        if (CurrentLineNumber == LineNumber)
+            break;
+
+        else
+            CurrentLineNumber++;
+
+    }
+
+    fclose(File);
+
+}
+
+
+int main()
+{
+
+    char FileName[] = "input.txt";
+
+    int Total = 0;
+    int Priority = 0;
+
+    int CurrentLine = 1;
+    int CurrentGroup = 1;
+
+
+    int LineCount = CountLines(FileName);
+
+    while (CurrentLine <= LineCount)
+    {
+
+        char SharedItem = ' ';
+
+        char *Member1 = malloc(256);
+        char *Member2 = malloc(256);
+        char *Member3 = malloc(256);
+
+        GetLine(FileName, CurrentLine, Member1);
+        GetLine(FileName, CurrentLine + 1, Member2);
+        GetLine(FileName, CurrentLine + 2, Member3);
+
+        for (int a = 0; a < strlen(Member1); a++)
+        {
+
+            char Item1 = Member1[a];
+
+            // Loop through each member looking for a shared character
+            for (int b = 0; b < strlen(Member2); b++)
+            {
+
+                char Item2 = Member2[b];
+
+                if (Item1 == Item2)
+                {
+                    for (int c = 0; c < strlen(Member3); c++)
+                    {
+
+                        char Item3 = Member3[c];
+
+                        if ((Item1 == Item3) && (Item2 == Item3))
+                        {
+                            SharedItem = Item3;
+                        }
+
+                    }
+
+                }
+
+                // Don't bother searching through the rest if a shared character is found
+                if (SharedItem != ' ')
+                    break;
+            }
+
+        }
+
+        printf("Shared Item of Group %d was %c\n", CurrentGroup, SharedItem);
+
+        // Convert character to integer value
+        int n = (int) SharedItem;
+
+        // A-Z ; - 38 to get values 27-52
+        if (n >= 65 && n <= 90)
+            Priority = n-38;
+
+        // a-z ; - 96 to get values 1-26
+        else if (n >= 97 && n <= 122)
+            Priority = n-96;
+
+
+        Total += Priority;
+
+        // Each group is three lines, so iterate by three.
+        CurrentLine += 3;
+        CurrentGroup++;
+
+    }
+
+    printf("Total Group Item Priority: %d\n", Total);
+
+    return 0;
+}