solved 3 in sufficiently short runtime

3/Makefile

@@ -0,0 +1,13 @@
+client: main.c
+	gcc -o main main.c -O3 -Wall -Wextra -g -march=x86-64-v3
+
+client-debug: main.c
+	gcc -o main main.c -O1 -Wall -Wextra -g -fsanitize=address
+
+client-debug-nosanitize: main.c
+	gcc -o main main.c -O1 -Wall -Wextra -g
+
+clean:
+	rm main
+
+.PHONY: clean

3/main.c

@@ -0,0 +1,62 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <time.h>
+
+char input[] =
+{
+#embed "input.txt"
+,'\0' // null terminator
+};
+
+int width = 0;
+int height = 0;
+
+int main(int argc, char *argv[]){
+    clock_t start, end;
+    start = clock();
+
+    while(input[width] != '\n'){
+        width++;
+    }
+    //printf("width: %d\n", width);
+    
+    while(input[height*(width+1)+1] != 0){
+        height++;
+    }
+    int count = 0;
+    for(int i = 0; i < height; i++){
+        int biggest = input[i*(width+1)];
+        int second_biggest = input[i*(width+1)+1]; 
+        for(int o = 0; o < width-1; o++){
+            
+            int num = input[i*(width+1)+o];
+            if(num>biggest){
+                biggest = num;
+                second_biggest = input[i*(width+1)+o+1];
+            }else if(second_biggest < input[i*(width+1)+o+1]){
+                second_biggest = input[i*(width+1)+o+1];
+            }
+        }
+        count += (biggest-0x30)*10 + (second_biggest-0x30);
+        for(int i = 0; i<12; i++){
+            
+        }
+        //printf(input);
+        //printf("count: %d\n", count);
+    }
+
+    end = clock();
+    printf("count: %d\n", count);
+    clock_t ticks_taken = end - start; 
+    double time_taken = ((double)ticks_taken)/CLOCKS_PER_SEC;
+    printf("time take: %f ticks\n", time_taken);
+    printf("CLOCKS_PER_SEC: %ld\n", CLOCKS_PER_SEC);
+
+
+    exit(1);
+}