oj.uz

답안 #466748

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
466748 2021-08-20T15:42:27 Z rainboy 육각형 영역 (APIO21_hexagon) C++17
36 / 100
 41 ms 4940 KB 
#include "hexagon.h"
#include <stdlib.h>
#include <vector>
 
using namespace std;
 
typedef vector<int> vi;
 
const int N = 200000, MD = 1000000007, V2 = 500000004, V6 = 166666668;
 
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 dx[] = { 1, 1, 0, -1, -1, 0 };
int dy[] = { 0, 1, 1, 0, -1, -1 };
 
int sum1(int n) {
	return (long long) n * (n + 1) % MD * V2 % MD;
}

int sum2(int n) {
	return (long long) n * (n + 1) % MD * (n * 2 + 1) % MD * V6 % MD;
}

long long cross(int x1, int y1, int x2, int y2) {
	return (long long) x1 * y2 - (long long) x2 * y1;
}
 
int hh[N], ll[N], ii[N], xx[N][2], yy[N], n, n_;
 
void add(long long x1, long long y1, long long x2, long long y2) {
	if (y1 < y2)
		xx[n_][0] = x1, xx[n_][1] = x2, yy[n_] = y1, n_++;
	else if (y1 > y2)
		xx[n_][0] = x2, xx[n_][1] = x1, yy[n_] = y2, n_++;
}
 
int compare(int i, int j) {
	int c = yy[i] != yy[j] ? yy[i] - yy[j] : (xx[i][0] + xx[i][1]) - (xx[j][0] + xx[j][1]);
 
	return c == 0 ? 0 : (c < 0 ? -1 : 1);
}
 
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 *ej[N], eo[N];
 
void append(int i, int j) {
	int o = eo[i]++;
 
	if (o >= 2 && (o & o - 1) == 0)
		ej[i] = (int *) realloc(ej[i], o * 2 * sizeof *ej[i]);
	ej[i][o] = j;
}
 
int area(int xi1, int xi2, int xj1, int xj2, int z, int l) {
	int d = ((xj2 - xj1) - (xi2 - xi1)) / l, x = xi2 - xi1 + 1;
 
	/* sum_{1}^{l-1} (x + d h) (z + h)
	 * = sum_{1}^{l-1} d h^2 + (x + z d) h + x z
	 * = d sum2(l - 1) + (x + z d) sum1(l - 1) + x z
	 */
	return (sum2(l - 1) * d + (long long) (x + z * d) * sum1(l - 1) + (long long) x * z) % MD;
}
 
int dfs(int p, int i, int d, int l) {
	int i_, s, xi1, xi2, o, x;
 
	i_ = i >> 1, s = i & 1, xi1 = xx[ii[i_ << 1 | 0]][s], xi2 = xx[ii[i_ << 1 | 1]][s];
	x = (long long) d * (xi2 - xi1 + 1) % MD;
	for (o = eo[i]; o--; ) {
		int j = ej[i][o];
 
		if (j != p) {
			int j_ = j >> 1, t = j & 1, xj1 = xx[ii[j_ << 1 | 0]][t], xj2 = xx[ii[j_ << 1 | 1]][t];
 
			if ((i ^ j) == 1)
				x = (x + dfs(i, j, d + l, l) + area(xi1, xi2, xj1, xj2, d, l)) % MD; 
			else {
				x = (x + dfs(i, j, d, l)) % MD;
				x = (x - (long long) d * (min(xi2, xj2) - max(xi1, xj1) + 1)) % MD;
			}
		}
	}
	return x;
}
 
int solve() {
	int l_, h, i, j, k, l, x, y, ans;
 
	l_ = ll[0];
	for (i = 0; i < n; i++)
		if (ll[i] != ll[0]) {
			l_ = 1;
			break;
		}
	if (l_ == 1) {
		n_ = 0, x = 0, y = 0;
		for (i = 0; i < n; i++)
			for (l = 0; l < ll[i]; l++)
				add(x, y, x + dx[hh[i]], y + dy[hh[i]]), x += dx[hh[i]], y += dy[hh[i]];
	} else {
		n_ = 0, x = 0, y = 0;
		for (i = 0; i < n; i++)
			add(x, y, x + dx[hh[i]] * l_, y + dy[hh[i]] * l_), x += dx[hh[i]] * l_, y += dy[hh[i]] * l_;
	}
	for (i = 0; i < n_; i++)
		ii[i] = i;
	sort(ii, 0, n_);
	n_ /= 2;
	for (i = 0; i < n_ * 2; i++)
		ej[i] = (int *) malloc(2 * sizeof *ej[i]), eo[i] = 0;
	for (i = 0; i < n_; i++)
		append(i << 1 | 0, i << 1 | 1), append(i << 1 | 1, i << 1 | 0);
	for (h = -1, i = 0; i < n_; h = i, i = j) {
		int y = yy[ii[i << 1 | 0]];
 
		j = i + 1;
		while (j < n_ && yy[ii[j << 1 | 0]] == y)
			j++;
		if (h != -1) {
			k = h, l = i;
			while (k < i && l < j)
				if (xx[ii[k << 1 | 1]][1] < xx[ii[l << 1 | 1]][0]) {
					if (xx[ii[l << 1 | 0]][0] <= xx[ii[k << 1 | 1]][1])
						append(k << 1 | 1, l << 1 | 0), append(l << 1 | 0, k << 1 | 1);
					k++;
				} else {
					if (xx[ii[k << 1 | 0]][1] <= xx[ii[l << 1 | 1]][0])
						append(k << 1 | 1, l << 1 | 0), append(l << 1 | 0, k << 1 | 1);
					l++;
				}
		}
	}
	ans = 0;
	for (i = 0; i < n_; i++) {
		int i0 = ii[i << 1 | 0], i1 = ii[i << 1 | 1];
 
		if (yy[i0] == 0 && xx[i0][0] <= 0 && 0 <= xx[i1][0]) {
			ans = dfs(-1, i << 1 | 0, 0, l_);
			for (i = 0; i < n_ * 2; i++)
				free(ej[i]);
			break;
		}
		if (yy[i1] + l_ == 0 && xx[i0][1] <= 0 && 0 <= xx[i1][1]) {
			ans = dfs(-1, i << 1 | 1, 0, l_);
			for (i = 0; i < n_ * 2; i++)
				free(ej[i]);
			break;
		}
	}
	return ans;
}
 
int draw_territory(int n_, int a, int b, vi hh_, vi ll_) {
	int h, i, x, y, ans1, ans2;
	long long area2, boundary, internal;
 
	n = n_;
	for (i = 0; i < n; i++)
		hh[i] = hh_[i] - 1, ll[i] = ll_[i];
	x = 0, y = 0, area2 = 0, boundary = 0;
	for (i = 0; i < n; i++) {
		h = hh[i];
		area2 += cross(x, y, x + dx[h] * ll[i], y + dy[h] * ll[i]);
		boundary += ll[i];
		x += dx[h] * ll[i], y += dy[h] * ll[i];
	}
	if (area2 < 0)
		area2 = -area2;
	internal = (area2 - boundary) / 2 + 1;
	ans1 = (boundary + internal) % MD, ans2 = 0;
	if (b > 0) {
		ans2 = 0;
		for (h = 0; h < 3; h++) {
			ans2 = (ans2 + solve()) % MD;
			for (i = 0; i < n; i++)
				hh[i] = (hh[i] + 1) % 6;
		}
		if (ans2 < 0)
			ans2 += MD;
		ans2 = (long long) ans2 * V2 % MD;
	}
	return ((long long) ans1 * a + (long long) ans2 * b) % MD;
}

Compilation message

hexagon.cpp: In function 'void append(int, int)':
hexagon.cpp:77:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   77 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~

Subtask #1
3.0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct

Subtask #2
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct

Subtask #3
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 2 ms 460 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 2 ms 460 KB Output is correct
7 Correct 6 ms 972 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 9 ms 1356 KB Output is correct
12 Correct 10 ms 1356 KB Output is correct
13 Correct 9 ms 1356 KB Output is correct
14 Correct 10 ms 1468 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 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

Subtask #5
15.0 / 15.0

# 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 2 ms 460 KB Output is correct
5 Correct 1 ms 332 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 460 KB Output is correct
9 Correct 6 ms 972 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 9 ms 1440 KB Output is correct
14 Correct 10 ms 1452 KB Output is correct
15 Correct 9 ms 1356 KB Output is correct
16 Correct 10 ms 1484 KB Output is correct
17 Correct 1 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 16 ms 2072 KB Output is correct
21 Correct 2 ms 460 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 22 ms 2796 KB Output is correct
24 Correct 35 ms 4420 KB Output is correct
25 Correct 35 ms 4536 KB Output is correct
26 Correct 18 ms 2380 KB Output is correct
27 Correct 13 ms 1740 KB Output is correct
28 Correct 9 ms 1228 KB Output is correct
29 Correct 39 ms 4924 KB Output is correct
30 Correct 39 ms 4940 KB Output is correct
31 Correct 40 ms 4932 KB Output is correct
32 Correct 41 ms 4932 KB Output is correct
33 Correct 18 ms 2448 KB Output is correct
34 Correct 10 ms 1356 KB Output is correct
35 Correct 1 ms 204 KB Output is correct
36 Correct 0 ms 204 KB Output is correct
37 Correct 0 ms 204 KB Output is correct

Subtask #6
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Incorrect 0 ms 204 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #8
0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -