답안 #433317

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
433317	2021-06-19T14:24:39 Z	rainboy	Archery (IOI09_archery)	C	63 / 100	351 ms	8028 KB

archery

#include <assert.h>
#include <stdio.h>

#define N	200000
#define N_	(1 << 18)	/* 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; }

int sum[N_ * 2], pref[N_ * 2], suf[N_ * 2], n1, n_;

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

	sum[i] = sum[l] + sum[r];
	pref[i] = min(pref[l], sum[l] + pref[r]);
	suf[i] = max(suf[l] + sum[r], suf[r]);
}

void build(int n) {
	int i;

	n1 = n;
	n_ = 1;
	while (n_ < n)
		n_ <<= 1;
	for (i = 0; i < n_; i++)
		if (i < n)
			sum[n_ + i] = pref[n_ + i] = suf[n_ + i] = -1;
	for (i = n_ - 1; i > 0; i--)
		pul(i);
}

int kk[N];

void update(int i, int x) {
	i += n_;
	pref[i] = suf[i] = sum[i] += x;
	while (i > 1)
		pul(i >>= 1);
}

int query(int i) {
	int l, r, x, y;

	x = y = 0;
	for (l = n_ + 0, r = n_ + i - 1; l <= r; l >>= 1, r >>= 1)
		if ((r & 1) == 0)
			x = max(x, suf[r] + y), y += sum[r], r--;
	x = max(x, suf[1] + y);
	for (l = n_ + i, r = n_ + n_ - 1; l <= r; l >>= 1, r >>= 1)
		if ((l & 1) == 1) {
			if (x + pref[l] <= 0) {
				i = l;
				while (i < n_)
					if (x + pref[i << 1 | 0] <= 0)
						i = i << 1 | 0;
					else
						x += sum[i << 1 | 0], i = i << 1 | 1;
				return i - n_;
			} else
				x += sum[l];
			l++;
		}
	if (x + pref[1] > 0)
		return -1;
	i = 1;
	while (i < n_)
		if (x + pref[i << 1 | 0] <= 0)
			i = i << 1 | 0;
		else
			x += sum[i << 1 | 0], i = i << 1 | 1;
	return i - n_;
}

int add(int i) {
	update(i, 1), kk[i]++;
	return query(i);
}

int delete(int i) {
	int j = query(i);

	update(i, -1), kk[i]--;
	return j;
}

int main() {
	static int aa[N * 2];
	int n, r, p, p_, i, i_, a_, mn;

	scanf("%d%d", &n, &r);
	for (i = 0; i < n * 2; i++)
		scanf("%d", &aa[i]), aa[i]--;
	build(n);
	a_ = aa[0];
	if (a_ == 0)
		i_ = n - 1;
	else if (a_ > n) {
		add(n - 1 - 0);
		for (i = 0; i < n * 2; i++)
			if (aa[i] > a_)
				add(n - 1 - (i / 2));
		p_ = n, i_ = -1;
		for (i = 0; i < n; i++) {
			if (i > 0) {
				if (aa[i * 2] > a_)
					delete(n - 1 - i), add(n - 1 - (i - 1));
				aa[(i - 1) * 2] = aa[i * 2], aa[i * 2] = a_;
			}
			p = n - 1 - add(n - 1 - i), delete(n - 1 - i);
			if (p_ >= p)
				p_ = p, i_ = i;
		}
	} else {
		for (i = 0; i < n * 2; i++)
			if (aa[i] < a_)
				add(i / 2);
		mn = 0;
		while (kk[mn] == 0)
			mn++;
		p_ = n, i_ = -1;
		for (i = 0; i < n; i++) {
			if (i > 0) {
				if (aa[i * 2] < a_) {
					delete(i), add(i - 1);
					if (mn == i)
						mn--;
				}
				aa[(i - 1) * 2] = aa[i * 2], aa[i * 2] = a_;
			}
			if (i < mn)
				delete(mn), p = add((mn + 1) % n), delete((mn + 1) % n), add(mn);
			else if (i > mn) {
				int push;

				p = delete(mn), push = kk[mn] == 2 && mn != 0;
				if (push)
					delete(mn), add((mn + 1) % n);
				p ^= add(i), delete(i);
				if (push)
					delete((mn + 1) % n), add(mn);
				add(mn);
			} else {
				if (i == 0)
					p = 0;
				else
					delete(mn), p = add((i + 1) % n), delete((i + 1) % n), add(mn);
			}
			p = (p - r % n + n) % n;
			if (p_ >= p)
				p_ = p, i_ = i;
		}
	}
	printf("%d\n", i_ + 1);
	return 0;
}

Compilation message

archery.c: In function 'main':
archery.c:92:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |  scanf("%d%d", &n, &r);
      |  ^~~~~~~~~~~~~~~~~~~~~
archery.c:94:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |   scanf("%d", &aa[i]), aa[i]--;
      |   ^~~~~~~~~~~~~~~~~~~

Subtask #1

5.0 / 6.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	204 KB	Output is correct
2	Correct	1 ms	332 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Incorrect	4 ms	332 KB	Output isn't correct
5	Correct	0 ms	204 KB	Output is correct
6	Correct	0 ms	204 KB	Output is correct

Subtask #2

58.0 / 94.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	0 ms	204 KB	Output isn't correct
2	Incorrect	1 ms	204 KB	Output isn't correct
3	Incorrect	2 ms	332 KB	Output isn't correct
4	Incorrect	21 ms	856 KB	Output isn't correct
5	Correct	351 ms	7348 KB	Output is correct
6	Incorrect	1 ms	204 KB	Output isn't correct
7	Incorrect	1 ms	332 KB	Output isn't correct
8	Incorrect	15 ms	856 KB	Output isn't correct
9	Correct	38 ms	1148 KB	Output is correct
10	Incorrect	1 ms	332 KB	Output isn't correct
11	Incorrect	40 ms	1184 KB	Output isn't correct
12	Correct	4 ms	332 KB	Output is correct
13	Incorrect	273 ms	4932 KB	Output isn't correct
14	Incorrect	7 ms	460 KB	Output isn't correct
15	Correct	61 ms	1412 KB	Output is correct
16	Incorrect	1 ms	204 KB	Output isn't correct
17	Incorrect	2 ms	332 KB	Output isn't correct
18	Correct	4 ms	332 KB	Output is correct
19	Incorrect	6 ms	332 KB	Output isn't correct
20	Incorrect	6 ms	460 KB	Output isn't correct
21	Incorrect	26 ms	1140 KB	Output isn't correct
22	Incorrect	49 ms	1376 KB	Output isn't correct
23	Incorrect	350 ms	7696 KB	Output isn't correct
24	Correct	1 ms	204 KB	Output is correct
25	Correct	1 ms	332 KB	Output is correct
26	Correct	6 ms	520 KB	Output is correct
27	Correct	25 ms	1172 KB	Output is correct
28	Correct	164 ms	4756 KB	Output is correct
29	Correct	2 ms	332 KB	Output is correct
30	Correct	4 ms	460 KB	Output is correct
31	Correct	25 ms	1164 KB	Output is correct
32	Correct	249 ms	7468 KB	Output is correct
33	Correct	1 ms	204 KB	Output is correct
34	Correct	1 ms	204 KB	Output is correct
35	Correct	3 ms	332 KB	Output is correct
36	Correct	3 ms	332 KB	Output is correct
37	Correct	20 ms	1088 KB	Output is correct
38	Correct	30 ms	1260 KB	Output is correct
39	Correct	1 ms	204 KB	Output is correct
40	Correct	1 ms	332 KB	Output is correct
41	Correct	3 ms	332 KB	Output is correct
42	Correct	3 ms	332 KB	Output is correct
43	Correct	6 ms	460 KB	Output is correct
44	Correct	12 ms	736 KB	Output is correct
45	Correct	22 ms	1100 KB	Output is correct
46	Correct	28 ms	1196 KB	Output is correct
47	Correct	307 ms	8028 KB	Output is correct