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Submission #433338

# Submission time Handle Problem Language Result Execution time Memory
433338 2021-06-19T15:25:37 Z rainboy Archery (IOI09_archery) C
100 / 100
 603 ms 8004 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], 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;

	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:91:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |  scanf("%d%d", &n, &r);
      |  ^~~~~~~~~~~~~~~~~~~~~
archery.c:93:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |   scanf("%d", &aa[i]), aa[i]--;
      |   ^~~~~~~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory 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 Correct 3 ms 332 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 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 2 ms 332 KB Output is correct
4 Correct 21 ms 856 KB Output is correct
5 Correct 347 ms 7300 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 2 ms 332 KB Output is correct
8 Correct 15 ms 848 KB Output is correct
9 Correct 30 ms 1168 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 38 ms 1184 KB Output is correct
12 Correct 4 ms 332 KB Output is correct
13 Correct 269 ms 4700 KB Output is correct
14 Correct 7 ms 460 KB Output is correct
15 Correct 60 ms 1416 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 3 ms 360 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 460 KB Output is correct
21 Correct 28 ms 1148 KB Output is correct
22 Correct 72 ms 1396 KB Output is correct
23 Correct 603 ms 7620 KB Output is correct
24 Correct 1 ms 204 KB Output is correct
25 Correct 1 ms 332 KB Output is correct
26 Correct 5 ms 460 KB Output is correct
27 Correct 25 ms 1192 KB Output is correct
28 Correct 158 ms 4800 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 1100 KB Output is correct
32 Correct 233 ms 7460 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 21 ms 972 KB Output is correct
38 Correct 30 ms 1248 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 520 KB Output is correct
44 Correct 11 ms 732 KB Output is correct
45 Correct 22 ms 1152 KB Output is correct
46 Correct 29 ms 1100 KB Output is correct
47 Correct 258 ms 8004 KB Output is correct