Submission #708046

#	Time	Username	Problem	Language	Result	Execution time	Memory
708046		rainboy	Dungeon 3 (JOI21_ho_t5)	C11	11 / 100	24 ms	512 KiB

Main

#include <stdio.h>

#define N	3000
#define M	3000
#define N_	(1 << 12)	/* N_ = pow2(ceil(log2(N))) */

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

int st[N_ * 2], n_;

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

	st[i] = max(st[l], st[r]);
}

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

	n_ = 1;
	while (n_ < n)
		n_ <<= 1;
	for (i = 0; i < n; i++)
		st[n_ + i] = aa[i];
	for (i = n_ - 1; i > 0; i--)
		pul(i);
}

int query(int l, int r) {
	int x = 0;

	for (l += n_, r += n_; l <= r; l >>= 1, r >>= 1) {
		if ((l & 1) == 1)
			x = max(x, st[l++]);
		if ((r & 1) == 0)
			x = max(x, st[r--]);
	}
	return x;
}

int main() {
	static long long xx[N + 1];
	static int cc[N], pp[N], qq[N], qu[N];
	int n, m, i, cnt;

	scanf("%d%d", &n, &m);
	for (i = 1; i <= n; i++)
		scanf("%lld", &xx[i]);
	build(xx + 1, n);
	for (i = 1; i <= n; i++)
		xx[i] += xx[i - 1];
	for (i = 0; i < n; i++)
		scanf("%d", &cc[i]);
	cnt = 0;
	for (i = 0; i < n; i++) {
		while (cnt && cc[qu[cnt - 1]] > cc[i])
			cnt--;
		pp[i] = cnt == 0 ? -1 : qu[cnt - 1];
		qu[cnt++] = i;
	}
	cnt = 0;
	for (i = n - 1; i >= 0; i--) {
		while (cnt && cc[qu[cnt - 1]] >= cc[i])
			cnt--;
		qq[i] = cnt == 0 ? n : qu[cnt - 1];
		qu[cnt++] = i;
	}
	while (m--) {
		int l, r, t;
		long long ans;

		scanf("%d%d%d", &l, &r, &t), l--, r--;
		if (query(l, r - 1) > t) {
			printf("-1\n");
			continue;
		}
		ans = 0;
		for (i = l; i < r; i++) {
			long long xl = pp[i] < l ? xx[i] : max(xx[i], xx[pp[i]] + t);
			long long xr = min(xx[i] + t, qq[i] < r ? xx[qq[i]] : xx[r]);

			ans += max(xr - xl, 0) * cc[i];
		}
		printf("%lld\n", ans);
	}
	return 0;
}

Compilation message (stderr)

Main.c: In function 'main':
Main.c:47:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
Main.c:49:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |   scanf("%lld", &xx[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~
Main.c:54:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |   scanf("%d", &cc[i]);
      |   ^~~~~~~~~~~~~~~~~~~
Main.c:73:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |   scanf("%d%d%d", &l, &r, &t), l--, r--;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 0 / 14
• Subtask 3: 0 / 31
• Subtask 4: 0 / 44