gistfile1.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char *argv[]) {
	int x=0, y=0, count=0, users=0;
	int max=0;
	scanf("%d%d", &count, &users);
	--count;
	int *stages = malloc(sizeof(*stages) * count);
	memset(stages, 0, count);
	for (int i=0; i < users; i++) {
		char tmp1[20], tmp2[20];
		scanf("%s%s%d%d", &tmp1, &tmp2, &x, &y);
		--y; --x;
		for (int k = x; k < y; k++) {
			stages[k] += 1;
			max = (stages[k] > max) ? stages[k] : max;
		}
	}
	for (int i=0; i < count; i++) {
		if (stages[i] == max) {
			printf("%d-%d\n", i+1, i+2);
		}
	}
	free(stages);
	return (0);
}