CODE:

#include 
#include 

typedef struct {
	unsigned int start;
	unsigned int end;
} range_t;

int comp(const void* x,const void* y) {
	range_t* a=(range_t*)x;
	range_t* b=(range_t*)y;
	if(a->start>b->start)return 1;
	if(a->startstart)return -1;
	if(a->end>b->end)return 1;
	if(a->endend)return -1;
	return 0;
}

int main(void) {
	int datanum;
	int i;
	int resultnum;
	range_t input[10000];
	range_t result[10000];
	scanf("%d",&datanum);
	for(i=0;iresult[resultnum-1].end) {
				result[resultnum-1].end=input[i].end;
			}
		} else {
			result[resultnum].start=input[i].start;
			result[resultnum].end=input[i].end;
			resultnum++;
		}
	}
	for(i=0;i<resultnum;i++) {
		printf("%u %u\n",result[i].start,result[i].end);
	}
	return 0;
}