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Submission #433336

# Submission time Handle Problem Language Result Execution time Memory
433336 2021-06-19T15:24:32 Z rainboy Archery (IOI09_archery) C
100 / 100
 653 ms 7996 KB 
#include <stdio.h>
#include <string.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) {
				if (kk[mn] == 1 || mn == 0)
					delete(mn), p = add(mn);
				else
					delete(mn), delete(mn), add((mn + 1) % n), p = delete((mn + 1) % n), p ^= add(mn), p ^= add(mn);
			} else if (i > mn) {
				int push;

				delete(mn), push = kk[mn] > 0 && 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 (mn == 0)
					delete(0), p = add(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
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 248 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 4 ms 332 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct

Subtask #2
94.0 / 94.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 3 ms 332 KB Output is correct
4 Correct 27 ms 824 KB Output is correct
5 Correct 365 ms 7304 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 3 ms 332 KB Output is correct
8 Correct 15 ms 856 KB Output is correct
9 Correct 37 ms 1144 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 37 ms 1128 KB Output is correct
12 Correct 4 ms 332 KB Output is correct
13 Correct 273 ms 4696 KB Output is correct
14 Correct 8 ms 460 KB Output is correct
15 Correct 65 ms 1368 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 2 ms 332 KB Output is correct
18 Correct 4 ms 332 KB Output is correct
19 Correct 7 ms 332 KB Output is correct
20 Correct 9 ms 520 KB Output is correct
21 Correct 29 ms 1136 KB Output is correct
22 Correct 75 ms 1368 KB Output is correct
23 Correct 653 ms 7572 KB Output is correct
24 Correct 1 ms 204 KB Output is correct
25 Correct 2 ms 332 KB Output is correct
26 Correct 6 ms 460 KB Output is correct
27 Correct 25 ms 1068 KB Output is correct
28 Correct 157 ms 4796 KB Output is correct
29 Correct 2 ms 332 KB Output is correct
30 Correct 5 ms 524 KB Output is correct
31 Correct 27 ms 1080 KB Output is correct
32 Correct 233 ms 7368 KB Output is correct
33 Correct 1 ms 204 KB Output is correct
34 Correct 0 ms 204 KB Output is correct
35 Correct 2 ms 332 KB Output is correct
36 Correct 3 ms 332 KB Output is correct
37 Correct 20 ms 972 KB Output is correct
38 Correct 30 ms 1268 KB Output is correct
39 Correct 1 ms 204 KB Output is correct
40 Correct 1 ms 344 KB Output is correct
41 Correct 2 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 14 ms 844 KB Output is correct
45 Correct 22 ms 1152 KB Output is correct
46 Correct 28 ms 1192 KB Output is correct
47 Correct 260 ms 7996 KB Output is correct