Submission #834145

#	Time	Username	Problem	Language	Result	Execution time	Memory
834145		rainboy	Progression (NOI20_progression)	C11	0 / 100	162 ms	57548 KiB

Progression

#include <stdio.h>

#define N	300000
#define N_	(1 << 19)	/* N_ = pow2(ceil(log2(N))) */

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

int kk[N_ * 2];
long long aap[N_ * 2]; int kkp[N_ * 2];
long long aaq[N_ * 2]; int kkq[N_ * 2];
int kk_[N_ * 2];
int n_;

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

	aap[i] = aap[l], kkp[i] = kkp[l] < kk[l] || aap[l] != aap[r] ? kkp[l] : kk[l] + kkp[r];
	aaq[i] = aaq[r], kkq[i] = kkq[r] < kk[r] || aaq[l] != aaq[r] ? kkq[r] : kkq[l] + kk[r];
	kk_[i] = max(kk_[l], kk_[r]);
	if (aaq[l] == aap[r])
		kk_[i] = max(kk_[i], kkq[l] + kkp[r]);
}

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

	n_ = 1;
	while (n_ < n - 1)
		n_ <<= 1;
	for (i = 0; i + 1 < n; i++) {
		kk[n_ + i] = 1;
		aap[n_ + i] = aaq[n_ + i] = aa[i + 1] - aa[i], kkp[n_ + i] = kkq[n_ + i] = kk_[n_ + i] = 1;
	}
	for (i = n_ - 1; i > 0; i--)
		kk[i] = kk[i << 1 | 0] + kk[i << 1 | 1], pul(i);
}

int query(int l, int r) {
	long long aq, ap;
	int kq, kp, k_;

	aq = 0, kq = 0, ap = 0, kp = 0, k_ = 0;
	for (l += n_, r += n_; l <= r; l >>= 1, r >>= 1) {
		if ((l & 1) == 1) {
			k_ = max(k_, kk_[l]);
			if (aq == aap[l])
				k_ = max(k_, kq + kkp[l]);
			aq = aaq[l], kq = kkq[l] < kk[l] || aq != aaq[l] ? kkq[l] : kq + kkq[l];
			l++;
		}
		if ((r & 1) == 0) {
			k_ = max(kk_[r], k_);
			if (aaq[r] == ap)
				k_ = max(k_, kkq[r] + kp);
			ap = aap[r], kp = kkp[r] < kk[r] || aap[r] != ap ? kkp[r] : kkp[r] + kp;
			r--;
		}
	}
	if (aq == ap)
		k_ = max(k_, kq + kp);
	return k_;
}

int main() {
	static int aa[N];
	int n, q, i;

	scanf("%d%d", &n, &q);
	for (i = 0; i < n; i++)
		scanf("%d", &aa[i]);
	build(aa, n);
	while (q--) {
		int t, l, r;

		scanf("%d%d%d", &t, &l, &r), l--, r--;
		printf("%d\n", l == r ? 1 : query(l, r - 1) + 1);
	}
	return 0;
}

Compilation message (stderr)

Progression.c: In function 'main':
Progression.c:68:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |  scanf("%d%d", &n, &q);
      |  ^~~~~~~~~~~~~~~~~~~~~
Progression.c:70:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~
Progression.c:75:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |   scanf("%d%d%d", &t, &l, &r), l--, r--;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 15
• Subtask 3: 0 / 35
• Subtask 4: 0 / 11
• Subtask 5: 0 / 13
• Subtask 6: 0 / 17