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Submission #544726

# Submission time Handle Problem Language Result Execution time Memory
544726 2022-04-02T16:12:02 Z rainboy Park (BOI16_park) C++
100 / 100
 772 ms 33132 KB 
#include <math.h>
#include <stdio.h>
#include <string.h>

#define N	2000
#define M	(N * (N - 1) / 2 + N * 4)
#define INF	0x3f3f3f3f

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

unsigned int X = 12345;

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

int ii[M], jj[M], rr_[M];

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

		while (j < k)
			if (rr_[hh[j]] == rr_[h])
				j++;
			else if (rr_[hh[j]] < rr_[h]) {
				tmp = hh[i], hh[i] = hh[j], hh[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = hh[j], hh[j] = hh[k], hh[k] = tmp;
			}
		sort(hh, l, i);
		l = k;
	}
}

int ds[N + 4];

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 main() {
	static int xx[N], yy[N], rr[N], hh[M];
	int n, m, q, x_, y_, h, i, j, r12, r13, r14, r23, r24, r34;

	scanf("%d%d%d%d", &n, &q, &x_, &y_);
	for (i = 0; i < n; i++)
		scanf("%d%d%d", &xx[i], &yy[i], &rr[i]);
	m = 0;
	for (i = 0; i < n; i++)
		for (j = i + 1; j < n; j++)
			ii[m] = i, jj[m] = j, rr_[m] = ((int) hypot(xx[i] - xx[j], yy[i] - yy[j]) - rr[i] - rr[j]) / 2 + 1, m++;

	for (i = 0; i < n; i++) {
		ii[m] = i, jj[m] = n, rr_[m] = (xx[i] - rr[i]) / 2 + 1, m++;
		ii[m] = i, jj[m] = n + 1, rr_[m] = (x_ - xx[i] - rr[i]) / 2 + 1, m++;
		ii[m] = i, jj[m] = n + 2, rr_[m] = (yy[i] - rr[i]) / 2 + 1, m++;
		ii[m] = i, jj[m] = n + 3, rr_[m] = (y_ - yy[i] - rr[i]) / 2 + 1, m++;
	}
	for (h = 0; h < m; h++)
		hh[h] = h;
	sort(hh, 0, m);
	memset(ds, -1, (n + 4) * sizeof *ds);
	r12 = r13 = r14 = r23 = r24 = r34 = INF;
	for (h = 0; h < m; h++) {
		int h_ = hh[h];

		join(ii[h_], jj[h_]);
		if (find(n + 2) == find(n) || find(n + 2) == find(n + 1) || find(n + 2) == find(n + 3))
			r12 = min(r12, rr_[h_]);
		if (find(n) == find(n + 1) || find(n + 2) == find(n + 3) || find(n) == find(n + 2) || find(n + 1) == find(n + 3))
			r13 = min(r13, rr_[h_]);
		if (find(n) == find(n + 1) || find(n) == find(n + 2) || find(n) == find(n + 3))
			r14 = min(r14, rr_[h_]);
		if (find(n + 1) == find(n) || find(n + 1) == find(n + 2) || find(n + 1) == find(n + 3))
			r23 = min(r23, rr_[h_]);
		if (find(n) == find(n + 1) || find(n + 2) == find(n + 3) || find(n + 1) == find(n + 2) || find(n) == find(n + 3))
			r24 = min(r24, rr_[h_]);
		if (find(n + 3) == find(n) || find(n + 3) == find(n + 1) || find(n + 3) == find(n + 2))
			r34 = min(r34, rr_[h_]);
	}
	while (q--) {
		int r, t;

		scanf("%d%d", &r, &t);
		if (t == 1) {
			printf("1");
			if (r < r12)
				printf("2");
			if (r < r13)
				printf("3");
			if (r < r14)
				printf("4");
		} else if (t == 2) {
			if (r < r12)
				printf("1");
			printf("2");
			if (r < r23)
				printf("3");
			if (r < r24)
				printf("4");
		} else if (t == 3) {
			if (r < r13)
				printf("1");
			if (r < r23)
				printf("2");
			printf("3");
			if (r < r34)
				printf("4");
		} else {
			if (r < r14)
				printf("1");
			if (r < r24)
				printf("2");
			if (r < r34)
				printf("3");
			printf("4");
		}
		printf("\n");
	}
	return 0;
}

Compilation message

park.cpp: In function 'int main()':
park.cpp:62:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |  scanf("%d%d%d%d", &n, &q, &x_, &y_);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
park.cpp:64:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |   scanf("%d%d%d", &xx[i], &yy[i], &rr[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
park.cpp:101:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  101 |   scanf("%d%d", &r, &t);
      |   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 689 ms 31772 KB Output is correct
2 Correct 706 ms 31808 KB Output is correct
3 Correct 723 ms 31772 KB Output is correct
4 Correct 752 ms 31768 KB Output is correct
5 Correct 729 ms 31764 KB Output is correct
6 Correct 722 ms 31692 KB Output is correct
7 Correct 481 ms 31764 KB Output is correct
8 Correct 475 ms 31888 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct

Subtask #2
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 1988 KB Output is correct
2 Correct 32 ms 2016 KB Output is correct
3 Correct 29 ms 2024 KB Output is correct
4 Correct 33 ms 2004 KB Output is correct
5 Correct 30 ms 1996 KB Output is correct
6 Correct 31 ms 2012 KB Output is correct
7 Correct 25 ms 1820 KB Output is correct
8 Correct 25 ms 1748 KB Output is correct

Subtask #3
42.0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 689 ms 31772 KB Output is correct
2 Correct 706 ms 31808 KB Output is correct
3 Correct 723 ms 31772 KB Output is correct
4 Correct 752 ms 31768 KB Output is correct
5 Correct 729 ms 31764 KB Output is correct
6 Correct 722 ms 31692 KB Output is correct
7 Correct 481 ms 31764 KB Output is correct
8 Correct 475 ms 31888 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 34 ms 1988 KB Output is correct
12 Correct 32 ms 2016 KB Output is correct
13 Correct 29 ms 2024 KB Output is correct
14 Correct 33 ms 2004 KB Output is correct
15 Correct 30 ms 1996 KB Output is correct
16 Correct 31 ms 2012 KB Output is correct
17 Correct 25 ms 1820 KB Output is correct
18 Correct 25 ms 1748 KB Output is correct
19 Correct 769 ms 33132 KB Output is correct
20 Correct 752 ms 32980 KB Output is correct
21 Correct 740 ms 33108 KB Output is correct
22 Correct 719 ms 32980 KB Output is correct
23 Correct 772 ms 32976 KB Output is correct
24 Correct 542 ms 33100 KB Output is correct