Submission #728028

#	Time	Username	Problem	Language	Result	Execution time	Memory
728028		rainboy	Computer Network (BOI14_network)	C++17	100 / 100	109 ms	7984 KiB

network

#include "network.h"

#define N	1000

unsigned int X = 12345;

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

int ii[N], dd[N];

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 (dd[ii[j]] == dd[i_])
				j++;
			else if (dd[ii[j]] < dd[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;
	}
}

void findRoute(int n, int s, int t) {
	int h, i;

	s--, t--;
	for (i = 0; i < n; i++)
		dd[i] = i == t ? 0 : ping(i + 1, t + 1) + 1;
	for (i = 0; i < n; i++)
		ii[i] = i;
	sort(ii, 0, n);
	for (h = n - 1; h >= 0; h--) {
		i = ii[h];
		if (dd[i] == dd[s] - 1 && ping(s + 1, i + 1) == 0)
			travelTo((s = i) + 1);
	}
}

Compilation message (stderr)

grader.c: In function 'int main()':
grader.c:48:11: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |     scanf ("%d%d%d%d", &N, &a, &b, &M);
      |     ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
grader.c:51:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |             scanf("%d", &distance[u][v]);
      |             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 25 / 25
• Subtask 2: 25 / 25
• Subtask 3: 25 / 25
• Subtask 4: 25 / 25