Submission #762823

#	Time	Username	Problem	Language	Result	Execution time	Memory
762823		rainboy	Travelling Merchant (CCO21_day2problem1)	C11	25 / 25	284 ms	39300 KiB

Main

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

#define N	200000
#define M	200000
#define INF	0x3f3f3f3f

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

int *eh[N], eo[N], *fh[N], fo[N], dd[N], n;
int ii[M], jj[M], ww[M], xx[M], yy[M], m;

void append(int **eh, int *eo, int i, int h) {
	int o = eo[i]++;

	if (o >= 2 && (o & o - 1) == 0)
		eh[i] = (int *) realloc(eh[i], o * 2 * sizeof *eh[i]);
	eh[i][o] = h;
}

int pq[N + M], *iq[N + 1], cnt[N + 1], mode;

int (*compare)(int, int);

int lt(int i, int j) {
	return mode < n ? xx[i - n] < xx[j - n] : dd[i] > dd[j];
}

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

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

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

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

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

void pq_add(int i) {
	pq[i] = ++cnt[mode], pq_up(i);
}

int pq_first() {
	return iq[mode][1];
}

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

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

int main() {
	int h, i, j, x, y, o;

	scanf("%d%d", &n, &m);
	for (i = 0; i < n; i++) {
		eh[i] = (int *) malloc(2 * sizeof *eh[i]);
		fh[i] = (int *) malloc(2 * sizeof *fh[i]);
	}
	for (h = 0; h < m; h++) {
		scanf("%d%d%d%d", &i, &j, &x, &y), i--, j--;
		ii[h] = i, jj[h] = j, xx[h] = x, yy[h] = y;
		append(eh, eo, i, h), append(fh, fo, j, h);
	}
	for (i = 0; i < n; i++) {
		mode = i;
		iq[mode] = (int *) malloc((eo[i] + 1) * sizeof *iq[mode]);
		for (o = eo[i]; o--; ) {
			h = eh[i][o];
			pq_add(n + h);
		}
		dd[i] = cnt[i] == 0 ? INF : xx[pq_first() - n];
	}
	mode = n;
	iq[mode] = (int *) malloc((n + 1) * sizeof *iq[mode]);
	for (i = 0; i < n; i++)
		pq_add(i);
	while (cnt[mode = n]) {
		j = pq_remove_first();
		for (o = fo[j]; o--; ) {
			h = fh[j][o], i = ii[h];
			xx[h] = max(xx[h], dd[j] == INF ? INF : dd[j] - yy[h]);
			mode = i, pq_dn(n + h);
			dd[i] = cnt[i] == 0 ? INF : xx[pq_first() - n];
			mode = n, pq_up(i);
		}
	}
	for (i = 0; i < n; i++)
		printf("%d ", dd[i] == INF ? -1 : dd[i]);
	printf("\n");
	return 0;
}

Compilation message (stderr)

Main.c: In function 'append':
Main.c:16:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   16 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
Main.c: In function 'main':
Main.c:69:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
Main.c:75:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |   scanf("%d%d%d%d", &i, &j, &x, &y), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 16 / 16