Submission #1058654

#	Time	Username	Problem	Language	Result	Execution time	Memory
1058654		rainboy	Text editor (CEOI24_editor)	C11	100 / 100	993 ms	314528 KiB

Main

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

#define N	1000000
#define N_	(N * 2 + 2)
#define INF	0x3f3f3f3f
#define LINF	0x3f3f3f3f3f3f3f3fLL

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

int *ej[N_], *ew[N_], eo[N_];

void append(int i, int j, int w) {
	int o = eo[i]++;

	if (o >= 2 && (o & o - 1) == 0) {
		ej[i] = (int *) realloc(ej[i], o * 2 * sizeof *ej[i]);
		ew[i] = (int *) realloc(ew[i], o * 2 * sizeof *ew[i]);
	}
	ej[i][o] = j, ew[i][o] = w;
}

long long dd[N_]; int iq[N_ + 1], pq[N_], cnt;

int lt(int i, int j) { return dd[i] < dd[j]; }

int p2(int p) {
	return (p *= 2) > cnt ? 0 : (p < cnt && lt(iq[p + 1], iq[p]) ? p + 1 : p);
}

void pq_up(int i) {
	int p, q, j;

	for (p = pq[i]; (q = p / 2) && lt(i, j = iq[q]); p = q)
		iq[pq[j] = p] = j;
	iq[pq[i] = p] = i;
}

void pq_dn(int i) {
	int p, q, j;

	for (p = pq[i]; (q = p2(p)) && lt(j = iq[q], i); p = q)
		iq[pq[j] = p] = j;
	iq[pq[i] = p] = i;
}

void pq_add_last(int i) {
	iq[pq[i] = ++cnt] = i;
}

int pq_remove_first() {
	int i = iq[1], j = iq[cnt--];

	if (j != i)
		pq[j] = 1, pq_dn(j);
	pq[i] = 0;
	return i;
}

int main() {
	static int yy[N], qu[N];
	int n, n_, s, t, i, is, it, j, o, y, ys, yt, w, cnt;
	long long d;

	scanf("%d%d%d%d%d", &n, &is, &ys, &it, &yt), is--, ys--, it--, yt--;
	for (i = 0; i < n; i++)
		scanf("%d", &yy[i]);
	n_ = n * 2 + 2, s = n_ - 2, t = n_ - 1;
	for (i = 0; i < n_; i++) {
		ej[i] = (int *) malloc(2 * sizeof *ej[i]);
		ew[i] = (int *) malloc(2 * sizeof *ew[i]);
	}
	memset(dd, 0x3f, n * sizeof *dd);
	for (i = is; i >= 0; i--) {
		if (yy[i] > ys) {
			append(s, i << 1 | 0, abs_(i - is) + abs_(0 - ys));
			append(s, i << 1 | 1, abs_(i - is) + abs_(yy[i] - ys));
			if (i == it)
				append(s, t, abs_(i - is) + abs_(yt - ys));
		} else {
			append(s, i << 1 | 1, abs_(i - is));
			break;
		}
	}
	for (i = is; i < n; i++) {
		if (yy[i] > ys) {
			append(s, i << 1 | 0, abs_(i - is) + abs_(0 - ys));
			append(s, i << 1 | 1, abs_(i - is) + abs_(yy[i] - ys));
			if (i == it)
				append(s, t, abs_(i - is) + abs_(yt - ys));
		} else {
			append(s, i << 1 | 1, abs_(i - is));
			break;
		}
	}
	for (i = 0; i < n; i++)
		append(i << 1 | 0, i << 1 | 1, yy[i]), append(i << 1 | 1, i << 1 | 0, yy[i]);
	for (i = 0; i + 1 < n; i++) {
		append(i << 1 | 0, i + 1 << 1 | 0, 1), append(i + 1 << 1 | 0, i << 1 | 0, 1);
		append(i << 1 | 1, i + 1 << 1 | 0, 1), append(i + 1 << 1 | 0, i << 1 | 1, 1);
	}
	cnt = 0;
	for (j = 0; j < n; j++) {
		while (cnt && yy[qu[cnt - 1]] > yy[j])
			cnt--;
		if (cnt) {
			i = qu[cnt - 1];
			append(j << 1 | 1, i << 1 | 1, abs_(i - j));
			append(i << 1 | 1, j << 1 | 1, abs_(j - i) + abs_(yy[j] - yy[i]));
		}
		qu[cnt++] = j;
	}
	cnt = 0;
	for (i = n - 1; i >= 0; i--) {
		while (cnt && yy[qu[cnt - 1]] > yy[i])
			cnt--;
		if (cnt) {
			j = qu[cnt - 1];
			append(i << 1 | 1, j << 1 | 1, abs_(j - i));
			append(j << 1 | 1, i << 1 | 1, abs_(i - j) + abs_(yy[i] - yy[j]));
		}
		qu[cnt++] = i;
	}
	y = INF;
	for (i = it; i >= 0; i--) {
		append(i << 1 | 0, t, abs_(it - i) + abs_(yt - 0));
		if (y > yy[i])
			y = yy[i], append(i << 1 | 1, t, abs_(it - i) + abs_(yt - yy[i]));
	}
	y = INF;
	for (i = it; i < n; i++) {
		append(i << 1 | 0, t, abs_(it - i) + abs_(yt - 0));
		if (y > yy[i])
			y = yy[i], append(i << 1 | 1, t, abs_(it - i) + abs_(yt - yy[i]));
	}
	memset(dd, 0x3f, n_ * sizeof *dd);
	dd[s] = 0, pq_add_last(s);
	while (cnt) {
		i = pq_remove_first();
		if (i == t) {
			printf("%lld\n", dd[i]);
			return 0;
		}
		for (o = eo[i]; o--; ) {
			j = ej[i][o], w = ew[i][o], d = dd[i] + w;
			if (dd[j] > d) {
				if (dd[j] == LINF)
					pq_add_last(j);
				dd[j] = d, pq_up(j);
			}
		}
	}
	return 0;
}

Compilation message (stderr)

Main.c: In function 'append':
Main.c:18:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   18 |  if (o >= 2 && (o & o - 1) == 0) {
      |                     ~~^~~
Main.c: In function 'main':
Main.c:101:24: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  101 |   append(i << 1 | 0, i + 1 << 1 | 0, 1), append(i + 1 << 1 | 0, i << 1 | 0, 1);
      |                      ~~^~~
Main.c:101:51: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  101 |   append(i << 1 | 0, i + 1 << 1 | 0, 1), append(i + 1 << 1 | 0, i << 1 | 0, 1);
      |                                                 ~~^~~
Main.c:102:24: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  102 |   append(i << 1 | 1, i + 1 << 1 | 0, 1), append(i + 1 << 1 | 0, i << 1 | 1, 1);
      |                      ~~^~~
Main.c:102:51: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  102 |   append(i << 1 | 1, i + 1 << 1 | 0, 1), append(i + 1 << 1 | 0, i << 1 | 1, 1);
      |                                                 ~~^~~
Main.c:67:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |  scanf("%d%d%d%d%d", &n, &is, &ys, &it, &yt), is--, ys--, it--, yt--;
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.c:69:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |   scanf("%d", &yy[i]);
      |   ^~~~~~~~~~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 14 / 14
• Subtask 3: 26 / 26
• Subtask 4: 11 / 11
• Subtask 5: 44 / 44