Submission #645740

#	Time	Username	Problem	Language	Result	Execution time	Memory
645740		rainboy	Fish 2 (JOI22_fish2)	C11	100 / 100	2039 ms	7464 KiB

fish2

#include <stdio.h>
#include <string.h>

#define N	100000
#define N_	(1 << 17)	/* N_ = pow2(ceil(log2(N + 1))) */
#define INF	0x7fffffff
#define LG	30

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

int aa[N], st1[N_ * 2], st2[N_ * 2], kk2[N_ * 2], lz2[N_], h_, n_;

void pul1(int i) {
	st1[i] = st1[i << 1 | 0] <= INF - st1[i << 1 | 1] ? st1[i << 1 | 0] + st1[i << 1 | 1] : INF;
}

void update1(int i, int a) {
	i += n_;
	st1[i] = a;
	while (i > 1)
		pul1(i >>= 1);
}

int queryl1(int r, int s) {
	int l = 0;

	for (l += n_, r += n_; l <= r; l >>= 1, r >>= 1)
		if ((r & 1) == 0) {
			if (s > st1[r])
				s -= st1[r--];
			else {
				while (r < n_)
					if (s <= st1[r << 1 | 1])
						r = r << 1 | 1;
					else
						s -= st1[r << 1 | 1], r = r << 1 | 0;
				return r - n_;
			}
		}
	return -1;
}

int queryr1(int l, int s) {
	int r = n_ - 1;

	for (l += n_, r += n_; l <= r; l >>= 1, r >>= 1)
		if ((l & 1) == 1) {
			if (s > st1[l])
				s -= st1[l++];
			else {
				while (l < n_)
					if (s <= st1[l << 1 | 0])
						l = l << 1 | 0;
					else
						s -= st1[l << 1 | 0], l = l << 1 | 1;
				return l - n_;
			}
		}
	return n_;
}

void put2(int i, int x) {
	st2[i] += x;
	if (i < n_)
		lz2[i] += x;
}

void pus2(int i) {
	if (lz2[i])
		put2(i << 1 | 0, lz2[i]), put2(i << 1 | 1, lz2[i]), lz2[i] = 0;
}

void pul2(int i) {
	if (!lz2[i]) {
		int l = i << 1, r = l | 1;

		if (st2[l] < st2[r])
			st2[i] = st2[l], kk2[i] = kk2[l];
		else if (st2[l] > st2[r])
			st2[i] = st2[r], kk2[i] = kk2[r];
		else
			st2[i] = st2[l], kk2[i] = kk2[l] + kk2[r];
	}
}

void push2(int i) {
	int h;

	for (h = h_; h > 0; h--)
		pus2(i >> h);
}

void pull2(int i) {
	while (i > 1)
		pul2(i >>= 1);
}

void update2(int l, int r, int x) {
	int l_ = l += n_, r_ = r += n_;

	if (l > r)
		return;
	push2(l_), push2(r_);
	for ( ; l <= r; l >>= 1, r >>= 1) {
		if ((l & 1) == 1)
			put2(l++, x);
		if ((r & 1) == 0)
			put2(r--, x);
	}
	pull2(l_), pull2(r_);
}

int query2(int l, int r) {
	int x = INF, k = 0;

	push2(l += n_), push2(r += n_);
	for ( ; l <= r; l >>= 1, r >>= 1) {
		if ((l & 1) == 1) {
			if (x > st2[l])
				x = st2[l], k = 0;
			if (x == st2[l])
				k += kk2[l];
			l++;
		}
		if ((r & 1) == 0) {
			if (x > st2[r])
				x = st2[r], k = 0;
			if (x == st2[r])
				k += kk2[r];
			r--;
		}
	}
	return x == 0 ? k : 0;
}

int ll[N], rr[N];

void updl(int l, int i, int x) {
	if (ll[i] < l || aa[ll[i]] > aa[i])
		update2(ll[i] + 1, i - 1, x);
}

void updr(int r, int i, int x) {
	if (rr[i] > r || aa[rr[i]] >= aa[i])
		update2(i + 1, rr[i] - 1, x);
}

void upd(int l, int r, int i, int x) {
	updl(l, i, x), updr(r, i, x);
}

void build(int *aa, int n) {
	int i;

	h_ = 0;
	while (1 << h_ <= n)
		h_++;
	n_ = 1 << h_;
	for (i = 0; i < n; i++)
		st1[n_ + i] = aa[i], kk2[n_ + i] = 1;
	for (i = n_ - 1; i > 0; i--)
		pul1(i), pul2(i);
}

int main() {
	int n, q, i, j;

	scanf("%d", &n);
	for (i = 0; i < n; i++)
		scanf("%d", &aa[i]);
	build(aa, n);
	scanf("%d", &q);
	for (i = 0; i < n; i++) {
		ll[i] = queryl1(i - 1, aa[i]), rr[i] = queryr1(i + 1, aa[i]);
		updl(0, i, 1), updr(n - 1, i, 1);
	}
	while (q--) {
		static char used[N];
		static int qu[N];
		int t, a, l, l_, r, r_, lg, cnt, h;

		scanf("%d", &t);
		if (t == 1) {
			int j;

			scanf("%d%d", &i, &a), i--;
			cnt = 0;
			qu[cnt++] = i;
			for (lg = 0; lg <= LG; lg++) {
				j = queryl1(i - 1, 1 << lg);
				if (j >= 0 && !used[j])
					used[j] = 1, qu[cnt++] = j;
				j = queryr1(i + 1, 1 << lg);
				if (j < n && !used[j])
					used[j] = 1, qu[cnt++] = j;
			}
			for (h = 0; h < cnt; h++) {
				if (qu[h] <= i)
					updr(n - 1, qu[h], -1);
				if (qu[h] >= i)
					updl(0, qu[h], -1);
			}
			aa[i] = a, update1(i, a);
			for (h = 0; h < cnt; h++) {
				if (qu[h] <= i) {
					rr[qu[h]] = queryr1(qu[h] + 1, aa[qu[h]]);
					updr(n - 1, qu[h], 1);
				}
				if (qu[h] >= i) {
					ll[qu[h]] = queryl1(qu[h] - 1, aa[qu[h]]);
					updl(0, qu[h], 1);
				}
				used[qu[h]] = 0;
			}
		} else {
			scanf("%d%d", &l, &r), l--, r--;
			cnt = 0;
			for (lg = 0; lg <= LG; lg++) {
				j = queryl1(l - 1, 1 << lg);
				if (j >= 0 && !used[j])
					used[j] = 1, qu[cnt++] = j;
				j = queryr1(l, 1 << lg);
				if (j < n && !used[j])
					used[j] = 1, qu[cnt++] = j;
				j = queryl1(r, 1 << lg);
				if (j >= 0 && !used[j])
					used[j] = 1, qu[cnt++] = j;
				j = queryr1(r + 1, 1 << lg);
				if (j < n && !used[j])
					used[j] = 1, qu[cnt++] = j;
			}
			l_ = l, r_ = r;
			for (h = 0; h < cnt; h++)
				if (qu[h] < l)
					updr(n - 1, qu[h], -1);
				else if (qu[h] > r)
					updl(0, qu[h], -1);
				else {
					if (ll[qu[h]] < l)
						l_ = max(l_, qu[h]);
					if (rr[qu[h]] > r)
						r_ = min(r_, qu[h]);
				}
			printf("%d\n", l_ > r_ ? 0 : query2(l_, r_));
			for (h = 0; h < cnt; h++)
				if (qu[h] < l)
					updr(n - 1, qu[h], 1);
				else if (qu[h] > r)
					updl(0, qu[h], 1);
			for (h = 0; h < cnt; h++)
				used[qu[h]] = 0;
		}
	}
	return 0;
}

Compilation message (stderr)

fish2.c: In function 'main':
fish2.c:169:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  169 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
fish2.c:171:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  171 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~
fish2.c:173:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  173 |  scanf("%d", &q);
      |  ^~~~~~~~~~~~~~~
fish2.c:183:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  183 |   scanf("%d", &t);
      |   ^~~~~~~~~~~~~~~
fish2.c:187:4: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  187 |    scanf("%d%d", &i, &a), i--;
      |    ^~~~~~~~~~~~~~~~~~~~~
fish2.c:217:4: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  217 |    scanf("%d%d", &l, &r), l--, r--;
      |    ^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 12 / 12
• Subtask 4: 23 / 23
• Subtask 5: 35 / 35
• Subtask 6: 17 / 17