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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#if 0
#define PART part1
#else
#define PART part2
#endif
#if 0
#define FILENAME "sample.txt"
#else
#define FILENAME "input.txt"
#endif
int res = 0;
void part1(int *longer, int *shorter)
{
if(longer[0] <= shorter[0] &&
longer[1] >= shorter[1])
res++;
}
void part2(int *longer, int *shorter)
{
if((shorter[0] >= longer[0] && shorter[0] <= longer[1]) ||
(shorter[1] >= longer[0] && shorter[1] <= longer[1]))
res++;
}
void parse()
{
FILE *fp = fopen(FILENAME, "r");
if(!fp) {
fprintf(stderr, "ERROR: Could not open file: %s\n", FILENAME);
exit(1);
}
char line[256];
while(fgets(line, sizeof(line), fp))
{
int range1[2];
int range2[2];
char *r1 = strtok(line, ",");
char *r2 = strtok(NULL, ",");
assert(strtok(NULL, ",") == NULL);
range1[0] = atoi(strtok(r1, "-"));
range1[1] = atoi(strtok(NULL, "-"));
assert(strtok(NULL, "-") == NULL);
range2[0] = atoi(strtok(r2, "-"));
range2[1] = atoi(strtok(NULL, "-"));
assert(strtok(NULL, "-") == NULL);
int len1 = range1[1] - range1[0] + 1;
int len2 = range2[1] - range2[0] + 1;
int *longer = (len1 > len2) ? range1 : range2;
int *shorter = (len1 > len2) ? range2 : range1;
PART(longer, shorter);
}
fclose(fp);
}
int main(void)
{
parse();
printf("%d\n", res);
return 0;
}
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