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#include <ctype.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <algds/vec.h>
#include <algds/str.h>
#include <algds/sort.h>
#include <stdlib.h>
#define PANIC do { \
fprintf(stderr, "panic at %s:%d\n", __FILE__, __LINE__); \
abort(); \
} while (0)
void expect_char(char e) {
int c = fpeek(stdin);
if (c != e) {
PANIC;
}
fgetc(stdin);
}
void skip_space() {
while (1) {
int c = fpeek(stdin);
if (c == EOF) return;
if (isspace(c)) {
fgetc(stdin);
} else {
return;
}
}
}
bool string2long(const char *s, long *num) {
char *end;
errno = 0;
*num = strtol(s, &end, 10);
if (end == s) {
return false;
}
if (errno != 0) {
return false;
}
return true;
}
int64_t parse_integer() {
long ret;
StrBuilder sb;
StrBuilder_init(&sb);
while (1) {
int c = fpeek(stdin);
if (isdigit(c)) {
fgetc(stdin);
StrBuilder_append_char(&sb, c);
} else {
break;
}
}
if (strlen(sb.buf) == 0) {
PANIC;
}
StrBuilder_append_char(&sb, '\0');
if (!string2long(sb.buf, &ret)) {
PANIC;
}
free(sb.buf);
return ret;
}
typedef struct {
int64_t start;
int64_t end;
} Range;
void Range_show(Range self, FILE *fp) {
fprintf(fp, "%ld-%ld", self.start, self.end);
}
VECTOR_DEF(Range)
VECTOR_IMPL(Range)
Range parse_range() {
Range ret;
ret.start = parse_integer();
expect_char('-');
ret.end = parse_integer();
expect_char('\n');
return ret;
}
int Range_cmp(Range a, Range b) {
if (a.start < b.start) {
return -1;
} else if (a.start == b.start) {
return 0;
} else {
return 1;
}
}
QSORT_DEF(Range)
QSORT_IMPL(Range)
int main() {
RangeVector ranges, unioned;
RangeVector_init(&ranges);
RangeVector_init(&unioned);
int c;
while (1) {
c = fpeek(stdin);
if (c == '\n') {
break;
} else if (isdigit(c)) {
Range r = parse_range();
RangeVector_push_back(&ranges, r);
} else {
PANIC;
}
}
expect_char('\n');
Range_qsort(ranges.buffer, RangeVector_len(&ranges));
if (RangeVector_len(&ranges) < 1) {
PANIC;
}
Range current = ranges.buffer[0];
for (int i = 1; i < RangeVector_len(&ranges); i++) {
if (ranges.buffer[i].start > current.end) {
RangeVector_push_back(&unioned, current);
current = ranges.buffer[i];
continue;
} else if (ranges.buffer[i].end > current.end) {
current.end = ranges.buffer[i].end;
}
}
RangeVector_push_back(&unioned, current);
long res = 0;
for (int i = 0; i < RangeVector_len(&unioned); i++) {
Range cur = unioned.buffer[i];
res += cur.end - cur.start + 1;
}
printf("%ld\n", res);
RangeVector_free(&ranges);
RangeVector_free(&unioned);
return 0;
}
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