oj.uz

답안 #532365

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
532365 2022-03-02T18:55:31 Z rainboy 절취선 (JOI14_ho_t5) C
10 / 100
 124 ms 10536 KB 
#include <stdio.h>
#include <string.h>

#define N	100004
#define N_	(1 << 17)	/* N_ = pow2(ceil(log2(N))) */

int min(int a, int b) { return a < b ? a : b; }
int max(int a, int b) { return a > b ? a : b; }

unsigned int X = 12345;

int rand_() {
	return (X *= 3) >> 1;
}

int xx[N * 2], yy[N * 2], tt[N * 2];

int (*compare)(int, int);

int compare_xt(int i, int j) {
	return xx[i] != xx[j] ? xx[i] - xx[j] : tt[j] - tt[i];
}

int compare_y(int i, int j) {
	return yy[i] - yy[j];
}

void sort(int *ii, int l, int r) {
	while (l < r) {
		int i = l, j = l, k = r, i_ = ii[l + rand_() % (r - l)], tmp;

		while (j < k) {
			int c = compare(ii[j], i_);

			if (c == 0)
				j++;
			else if (c < 0) {
				tmp = ii[i], ii[i] = ii[j], ii[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = ii[j], ii[j] = ii[k], ii[k] = tmp;
			}
		}
		sort(ii, l, i);
		l = k;
	}
}

int ft[N * 2];

void ft_update(int i, int n, int x) {
	while (i < n) {
		ft[i] += x;
		i |= i + 1;
	}
}

int query(int i) {
	int x = 0;

	while (i >= 0) {
		x += ft[i];
		i &= i + 1, i--;
	}
	return x;
}

int ii[N * 2], m;

long long get_ve(int n) {
	int h;
	long long ve;

	ve = n;
	for (h = 0; h < m; h++) {
		int i = ii[h];

		if (tt[i] == 0)
			ve -= query(yy[i ^ 1]) - query(yy[i] - 1);
		else
			ft_update(yy[i], n * 2, tt[i]);
	}
	return ve;
}

int ds[N];

int find(int i) {
	return ds[i] < 0 ? i : (ds[i] = find(ds[i]));
}

void join(int i, int j) {
	i = find(i);
	j = find(j);
	if (i == j)
		return;
	if (ds[i] > ds[j])
		ds[i] = j;
	else {
		if (ds[i] == ds[j])
			ds[i]--;
		ds[j] = i;
	}
}

int st[N_ * 2], n_;

void pul(int i) {
	int l = i << 1 | 0, r = l | 1;

	if (st[l] == -2 || st[r] == -2)
		st[i] = -2;
	else if (st[l] == -1)
		st[i] = st[r];
	else if (st[r] == -1)
		st[i] = st[l];
	else
		st[i] = find(st[l]) != find(st[r]) ? -2 : st[l];
}

void pull(int i) {
	while (i > 1)
		pul(i >>= 1);
}

void st_update(int i, int u) {
	i += n_, st[i] = u, pull(i);
}

void join1(int i, int u) {
	if (st[i] == -1)
		return;
	if (st[i] != -2) {
		join(u, st[i]);
		return;
	}
	join1(i << 1 | 0, u), join1(i << 1 | 1, u);
	pul(i);
}

void join_(int l, int r, int u) {
	int l_ = l += n_, r_ = r += n_;

	for ( ; l <= r; l >>= 1, r >>= 1) {
		if ((l & 1) == 1)
			join1(l++, u);
		if ((r & 1) == 0)
			join1(r--, u);
	}
	pull(l_), pull(r_);
}

int get_c(int n) {
	int h, i, c;

	n_ = 1;
	while (n_ < n * 2)
		n_ <<= 1;
	memset(st, -1, n_ * 2 * sizeof *st);
	memset(ds, -1, n * sizeof *ds);
	for (h = 0; h < m; h++) {
		i = ii[h];
		if (tt[i] == 0)
			join_(yy[i], yy[i ^ 1], i >> 1);
		else
			st_update(yy[i], tt[i] == 1 ? i >> 1 : -1);
	}
	c = 0;
	for (i = 0; i < n; i++)
		if (ds[i] < 0)
			c++;
	return c;
}

int main() {
	int w, h, n, i, y, tmp;

	scanf("%d%d%d", &w, &h, &n);
	for (i = 0; i < n * 2; i++)
		scanf("%d%d", &xx[i], &yy[i]);
	xx[n << 1 | 0] = 0, yy[n << 1 | 0] = 0, xx[n << 1 | 1] = w, yy[n << 1 | 1] = 0;
	xx[n + 1 << 1 | 0] = w, yy[n + 1 << 1 | 0] = 0, xx[n + 1 << 1 | 1] = w, yy[n + 1 << 1 | 1] = h;
	xx[n + 2 << 1 | 0] = w, yy[n + 2 << 1 | 0] = h, xx[n + 2 << 1 | 1] = 0, yy[n + 2 << 1 | 1] = h;
	xx[n + 3 << 1 | 0] = 0, yy[n + 3 << 1 | 0] = h, xx[n + 3 << 1 | 1] = 0, yy[n + 3 << 1 | 1] = 0;
	n += 4;
	for (i = 0; i < n; i++) {
		if (xx[i << 1 | 0] > xx[i << 1 | 1])
			tmp = xx[i << 1 | 0], xx[i << 1 | 0] = xx[i << 1 | 1], xx[i << 1 | 1] = tmp;
		if (yy[i << 1 | 0] > yy[i << 1 | 1])
			tmp = yy[i << 1 | 0], yy[i << 1 | 0] = yy[i << 1 | 1], yy[i << 1 | 1] = tmp;
	}
	for (i = 0; i < n * 2; i++)
		ii[i] = i;
	for (i = 0; i < n * 2; i++)
		tt[i] = xx[i] == xx[i ^ 1] ? 0 : ((i & 1) == 0 ? 1 : -1);
	compare = compare_y, sort(ii, 0, n * 2);
	for (i = 0, y = 0; i < n * 2; i++)
		yy[ii[i]] = i + 1 == n * 2 || yy[ii[i + 1]] != yy[ii[i]] ? y++ : y;
	m = 0;
	for (i = 0; i < n; i++) {
		ii[m++] = i << 1 | 0;
		if (tt[i << 1 | 0] != 0)
			ii[m++] = i << 1 | 1;
	}
	compare = compare_xt, sort(ii, 0, m);
	printf("%lld\n", get_c(n) - get_ve(n));
	return 0;
}

Compilation message

2014_ho_t5.c: In function 'main':
2014_ho_t5.c:183:7: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  183 |  xx[n + 1 << 1 | 0] = w, yy[n + 1 << 1 | 0] = 0, xx[n + 1 << 1 | 1] = w, yy[n + 1 << 1 | 1] = h;
      |     ~~^~~
2014_ho_t5.c:183:31: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  183 |  xx[n + 1 << 1 | 0] = w, yy[n + 1 << 1 | 0] = 0, xx[n + 1 << 1 | 1] = w, yy[n + 1 << 1 | 1] = h;
      |                             ~~^~~
2014_ho_t5.c:183:55: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  183 |  xx[n + 1 << 1 | 0] = w, yy[n + 1 << 1 | 0] = 0, xx[n + 1 << 1 | 1] = w, yy[n + 1 << 1 | 1] = h;
      |                                                     ~~^~~
2014_ho_t5.c:183:79: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  183 |  xx[n + 1 << 1 | 0] = w, yy[n + 1 << 1 | 0] = 0, xx[n + 1 << 1 | 1] = w, yy[n + 1 << 1 | 1] = h;
      |                                                                             ~~^~~
2014_ho_t5.c:184:7: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  184 |  xx[n + 2 << 1 | 0] = w, yy[n + 2 << 1 | 0] = h, xx[n + 2 << 1 | 1] = 0, yy[n + 2 << 1 | 1] = h;
      |     ~~^~~
2014_ho_t5.c:184:31: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  184 |  xx[n + 2 << 1 | 0] = w, yy[n + 2 << 1 | 0] = h, xx[n + 2 << 1 | 1] = 0, yy[n + 2 << 1 | 1] = h;
      |                             ~~^~~
2014_ho_t5.c:184:55: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  184 |  xx[n + 2 << 1 | 0] = w, yy[n + 2 << 1 | 0] = h, xx[n + 2 << 1 | 1] = 0, yy[n + 2 << 1 | 1] = h;
      |                                                     ~~^~~
2014_ho_t5.c:184:79: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  184 |  xx[n + 2 << 1 | 0] = w, yy[n + 2 << 1 | 0] = h, xx[n + 2 << 1 | 1] = 0, yy[n + 2 << 1 | 1] = h;
      |                                                                             ~~^~~
2014_ho_t5.c:185:7: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  185 |  xx[n + 3 << 1 | 0] = 0, yy[n + 3 << 1 | 0] = h, xx[n + 3 << 1 | 1] = 0, yy[n + 3 << 1 | 1] = 0;
      |     ~~^~~
2014_ho_t5.c:185:31: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  185 |  xx[n + 3 << 1 | 0] = 0, yy[n + 3 << 1 | 0] = h, xx[n + 3 << 1 | 1] = 0, yy[n + 3 << 1 | 1] = 0;
      |                             ~~^~~
2014_ho_t5.c:185:55: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  185 |  xx[n + 3 << 1 | 0] = 0, yy[n + 3 << 1 | 0] = h, xx[n + 3 << 1 | 1] = 0, yy[n + 3 << 1 | 1] = 0;
      |                                                     ~~^~~
2014_ho_t5.c:185:79: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  185 |  xx[n + 3 << 1 | 0] = 0, yy[n + 3 << 1 | 0] = h, xx[n + 3 << 1 | 1] = 0, yy[n + 3 << 1 | 1] = 0;
      |                                                                             ~~^~~
2014_ho_t5.c:179:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  179 |  scanf("%d%d%d", &w, &h, &n);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
2014_ho_t5.c:181:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  181 |   scanf("%d%d", &xx[i], &yy[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 2 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 2 ms 356 KB Output is correct
11 Correct 2 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 2 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 0 ms 204 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 2 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 2 ms 356 KB Output is correct
11 Correct 2 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 2 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 0 ms 204 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 2 ms 332 KB Output is correct
22 Correct 2 ms 332 KB Output is correct
23 Correct 3 ms 332 KB Output is correct
24 Correct 2 ms 332 KB Output is correct
25 Correct 2 ms 332 KB Output is correct
26 Correct 2 ms 332 KB Output is correct
27 Correct 3 ms 332 KB Output is correct
28 Correct 2 ms 332 KB Output is correct

Subtask #3
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 16 ms 876 KB Output is correct
6 Correct 75 ms 5264 KB Output is correct
7 Runtime error 124 ms 10536 KB Execution killed with signal 6
8 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 2 ms 332 KB Output is correct
3 Correct 18 ms 952 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 2 ms 332 KB Output is correct
6 Runtime error 111 ms 6596 KB Execution killed with signal 6
7 Halted 0 ms 0 KB -

Subtask #5
0 / 50.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 2 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 2 ms 356 KB Output is correct
11 Correct 2 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 2 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 0 ms 204 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 2 ms 332 KB Output is correct
22 Correct 2 ms 332 KB Output is correct
23 Correct 3 ms 332 KB Output is correct
24 Correct 2 ms 332 KB Output is correct
25 Correct 2 ms 332 KB Output is correct
26 Correct 2 ms 332 KB Output is correct
27 Correct 3 ms 332 KB Output is correct
28 Correct 2 ms 332 KB Output is correct
29 Correct 2 ms 332 KB Output is correct
30 Correct 1 ms 332 KB Output is correct
31 Correct 1 ms 332 KB Output is correct
32 Correct 2 ms 332 KB Output is correct
33 Correct 16 ms 876 KB Output is correct
34 Correct 75 ms 5264 KB Output is correct
35 Runtime error 124 ms 10536 KB Execution killed with signal 6
36 Halted 0 ms 0 KB -