Submission #485397

#	Time	Username	Problem	Language	Result	Execution time	Memory
485397		rainboy	Kosta (COI14_kosta)	C11	100 / 100	206 ms	13728 KiB

kosta

#include <stdio.h>

#define N1	200000
#define N2	50000
#define LG	16	/* LG = ceil(log2(N2)) */
#define N_	(1 + N2 * (LG + 1))
#define INF	0x3f3f3f3f

int min(int a, int b) { return a < b ? a : b; }
int max(int a, int b) { return a > b ? a : b; }
int abs_(int a) { return a > 0 ? a : -a; }

unsigned int X = 12345;

int rand_() {
	return (X *= 3) >> 1;
}

int *zz;

void sort(int *ii, int l, int r) {
	while (l < r) {
		int i = l, j = l, k = r, i_ = ii[l + rand_() % (r - l)], tmp;

		while (j < k)
			if (zz[ii[j]] == zz[i_])
				j++;
			else if (zz[ii[j]] < zz[i_]) {
				tmp = ii[i], ii[i] = ii[j], ii[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = ii[j], ii[j] = ii[k], ii[k] = tmp;
			}
		sort(ii, l, i);
		l = k;
	}
}

int ll[N_], rr[N_], kk[N_];

int update(int t, int l, int r, int i) {
	static int _ = 1;
	int t_ = _++;

	kk[t_] = kk[t] + 1;
	if (r - l > 1) {
		int m = (l + r) / 2;

		if (i < m)
			ll[t_] = update(ll[t], l, m, i), rr[t_] = rr[t];
		else
			ll[t_] = ll[t], rr[t_] = update(rr[t], m, r, i);
	}
	return t_;
}

int query(int t, int l, int r, int ql, int qr) {
	int m;

	if (qr <= l || r <= ql || t == 0)
		return 0;
	if (ql <= l && r <= qr)
		return kk[t];
	m = (l + r) / 2;
	return query(ll[t], l, m, ql, qr) + query(rr[t], m, r, ql, qr);
}

int xx[N1], yy[N1], xx_[N2], yy_[N2], ii[N2], jj[N2], tt[N2], n;

int t, i1, i2;

int check(int d_) {
	if (t == 1) {
		int i, xmn, xmx, ymn, ymx;

		xmn = INF, xmx = -INF, ymn = INF, ymx = -INF;
		for (i = 0; i < n; i++) {
			xmn = min(xmn, xx[i]), xmx = max(xmx, xx[i]);
			ymn = min(ymn, yy[i]), ymx = max(ymx, yy[i]);
		}
		for (i1 = 0; i1 < n; i1++)
			if (xx[i1] - xmn <= d_ && xmx - xx[i1] <= d_ && yy[i1] - ymn <= d_ && ymx - yy[i1] <= d_)
				return 1;
		return 0;
	} else {
		static int iil[N2], iir[N2], iid[N2], iiu[N2], iil_[N2], iir_[N2], iid_[N2], iiu_[N2];
		int i, i_, j, j_, l, r, d, u;

		for (i = 0, j = 0; j < n; j++) {
			while (i < n && xx[ii[j]] - xx[ii[i]] > d_)
				i++;
			iil[ii[j]] = i;
		}
		for (i = n - 1, j = n - 1; i >= 0; i--) {
			while (j >= 0 && xx[ii[j]] - xx[ii[i]] > d_)
				j--;
			iir[ii[i]] = j;
		}
		for (i = 0, j = 0; j < n; j++) {
			while (i < n && yy[jj[j]] - yy[jj[i]] > d_)
				i++;
			iid[jj[j]] = i;
		}
		for (i = n - 1, j = n - 1; i >= 0; i--) {
			while (j >= 0 && yy[jj[j]] - yy[jj[i]] > d_)
				j--;
			iiu[jj[i]] = j;
		}
		for (i = 0; i < n; i++)
			iil_[i] = 0, iir_[i] = n - 1, iid_[i] = 0, iiu_[i] = n - 1;
		l = 0, r = n - 1, d = 0, u = n - 1;
		for (i = 0, j = 0; j < n; j++) {
			j_ = ii[j];
			while (i < n && xx[j_] - xx[i_ = ii[i]] > d_) {
				l = max(l, iil[i_]), r = min(r, iir[i_]);
				d = max(d, iid[i_]), u = min(u, iiu[i_]);
				i++;
			}
			iil_[j_] = max(iil_[j_], l), iir_[j_] = min(iir_[j_], r);
			iid_[j_] = max(iid_[j_], d), iiu_[j_] = min(iiu_[j_], u);
		}
		l = 0, r = n - 1, d = 0, u = n - 1;
		for (i = n - 1, j = n - 1; i >= 0; i--) {
			i_ = ii[i];
			while (j >= 0 && xx[j_ = ii[j]] - xx[i_] > d_) {
				l = max(l, iil[j_]), r = min(r, iir[j_]);
				d = max(d, iid[j_]), u = min(u, iiu[j_]);
				j--;
			}
			iil_[i_] = max(iil_[i_], l), iir_[i_] = min(iir_[i_], r);
			iid_[i_] = max(iid_[i_], d), iiu_[i_] = min(iiu_[i_], u);
		}
		l = 0, r = n - 1, d = 0, u = n - 1;
		for (i = 0, j = 0; j < n; j++) {
			j_ = jj[j];
			while (i < n && yy[j_] - yy[i_ = jj[i]] > d_) {
				l = max(l, iil[i_]), r = min(r, iir[i_]);
				d = max(d, iid[i_]), u = min(u, iiu[i_]);
				i++;
			}
			iil_[j_] = max(iil_[j_], l), iir_[j_] = min(iir_[j_], r);
			iid_[j_] = max(iid_[j_], d), iiu_[j_] = min(iiu_[j_], u);
		}
		l = 0, r = n - 1, d = 0, u = n - 1;
		for (i = n - 1, j = n - 1; i >= 0; i--) {
			i_ = jj[i];
			while (j >= 0 && yy[j_ = jj[j]] - yy[i_] > d_) {
				l = max(l, iil[j_]), r = min(r, iir[j_]);
				d = max(d, iid[j_]), u = min(u, iiu[j_]);
				j--;
			}
			iil_[i_] = max(iil_[i_], l), iir_[i_] = min(iir_[i_], r);
			iid_[i_] = max(iid_[i_], d), iiu_[i_] = min(iiu_[i_], u);
		}
		for (i1 = 0; i1 < n; i1++) {
			int l = iil_[i1], r = iir_[i1], d = iid_[i1], u = iiu_[i1];

			if (l <= r && d <= u && query(tt[r], 0, n, d, u + 1) - (l == 0 ? 0 : query(tt[l - 1], 0, n, d, u + 1)) > 0) {
				for (i2 = 0; i2 < n; i2++)
					if (xx_[i2] >= l && xx_[i2] <= r && yy_[i2] >= d && yy_[i2] <= u)
						break;
				return 1;
			}
		}
		return 0;
	}
}

int main() {
	int i, j, lower, upper;

	scanf("%d%d", &t, &n);
	for (i = 0; i < n; i++) {
		int x, y;

		scanf("%d%d", &x, &y);
		xx[i] = x + y, yy[i] = x - y;
	}
	if (t == 2) {
		for (i = 0; i < n; i++)
			ii[i] = i;
		zz = xx, sort(ii, 0, n);
		for (i = 0; i < n; i++)
			xx_[ii[i]] = i;
		for (j = 0; j < n; j++)
			jj[j] = j;
		zz = yy, sort(jj, 0, n);
		for (j = 0; j < n; j++)
			yy_[jj[j]] = j;
		for (i = 0; i < n; i++)
			tt[i] = update(i == 0 ? 0 : tt[i - 1], 0, n, yy_[ii[i]]);
	}
	lower = -1, upper = INF;
	while (upper - lower > 1) {
		int d = (lower + upper) / 2;

		if (check(d))
			upper = d;
		else
			lower = d;
	}
	check(upper);
	printf("%d\n", upper);
	if (t == 1)
		printf("%d\n", i1 + 1);
	else
		printf("%d %d\n", i1 + 1, i2 + 1);
	return 0;
}

Compilation message (stderr)

kosta.c: In function 'main':
kosta.c:173:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  173 |  scanf("%d%d", &t, &n);
      |  ^~~~~~~~~~~~~~~~~~~~~
kosta.c:177:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  177 |   scanf("%d%d", &x, &y);
      |   ^~~~~~~~~~~~~~~~~~~~~

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