day 8

CMakeLists.txt

@@ -3,10 +3,11 @@ project(aoc2019 C)
 
 set(CMAKE_C_STANDARD 99)
 
-add_executable(day1 day1.c)
-add_executable(day2 day2.c)
-add_executable(day3 day3.c)
-add_executable(day4 day4.c)
-add_executable(day5 day5.c intcode.c)
-add_executable(day6 day6.c)
-add_executable(day7 day7.c intcode.c)
+add_executable(day1 d1-10/day1.c)
+add_executable(day2 intcode/day2.c)
+add_executable(day3 d1-10/day3.c)
+add_executable(day4 d1-10/day4.c)
+add_executable(day5 intcode/day5.c intcode/intcode.c)
+add_executable(day6 d1-10/day6.c)
+add_executable(day7 intcode/day7.c intcode/intcode.c)
+add_executable(day8 d1-10/day8.c)

d1-10/day8.c

@@ -0,0 +1,46 @@
+//
+// Created by red on 08/12/19.
+//
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argv, char** argc) {
+  char* filename = argc[1];
+  FILE* f = fopen(filename, "r");
+  char buffer[15001];
+  char final[150];
+  memset((void*) final, '2', 150*sizeof(char));
+  fscanf(f, "%s", buffer);
+  int min_0s = 150;
+  int no_1s = 0;
+  int no_2s = 0;
+  for (size_t layer = 0; layer < 100; layer++) {
+    int num_0s = 0;
+    int num_1s = 0;
+    int num_2s = 0;
+    for (size_t i = 0; i < 150; i++) {
+      char c = buffer[layer*150 + i];
+      switch (c) {
+      case '0': num_0s++; break;
+      case '1': num_1s++; break;
+      case '2': num_2s++; break;
+      default: break;
+      }
+      if (final[i] == '2' && c != '2') final[i] = c;
+    }
+    if (num_0s < min_0s) {
+      min_0s = num_0s;
+      no_1s = num_1s;
+      no_2s = num_2s;
+    }
+  }
+  printf("Smallest no. of 0s found: %d, checksum: %d\n", min_0s, no_1s*no_2s);
+  for (size_t i = 0; i < 150; i++) {
+    printf("%c", final[i]);
+    if (i % 25 == 24) {
+      puts("");
+    }
+  }
+}