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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if 0
#define PART_1
#else
#define PART_2
#endif
#if 0
#define FILE_PATH "example.txt"
#else
#define FILE_PATH "input.txt"
#endif
int q_answ = 0;
void parse()
{
FILE *fp = fopen(FILE_PATH, "r");
if(!fp) {
fprintf(stderr, "ERROR: Could not open file: %s", FILE_PATH);
exit(EXIT_FAILURE);
}
char questions[26] = "abcdefghijklmnopqrstuvwxyz";
int answered[26] = {0};
#ifdef PART_2
int ppl_in_group = 0;
#endif
char line[32];
while(fgets(line, sizeof(line), fp) != NULL)
{
if(line[0] == '\n' || strncmp(line, "EOF", 3) == 0) {
for(int i = 0; i < 26; i++) {
#ifdef PART_1
q_answ += answered[i];
#endif
#ifdef PART_2
if(answered[i] == ppl_in_group)
q_answ++;
#endif
}
#ifdef PART_2
ppl_in_group = 0;
#endif
memset(answered, 0, sizeof(answered));
continue;
}
#ifdef PART_2
ppl_in_group++;
#endif
for(int i = 0; i < strlen(line); i++)
for(int j = 0; j < 26; j++)
if(line[i] == questions[j]) {
#ifdef PART_1
answered[j] = 1;
#endif
#ifdef PART_2
answered[j]++;
#endif
}
}
fclose(fp);
}
int main(void)
{
parse();
printf("%d questions answered\n", q_answ);
return 0;
}
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