Submission #544724

#	Time	Username	Problem	Language	Result	Execution time	Memory
544724		rainboy	Bosses (BOI16_bosses)	C11	100 / 100	541 ms	604 KiB

bosses

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

#define N	5000
#define INF	0x3f3f3f3f

int min(int a, int b) { return a < b ? a : b; }

int *ej[N], eo[N];

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

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

int solve(int n, int s) {
	static int dd[N], qu[N];
	int i, head, cnt, ans;

	for (i = 0; i < n; i++)
		dd[i] = n + 1;
	head = cnt = 0;
	dd[s] = 1, qu[head + cnt++] = s;
	while (cnt) {
		int d, o;

		i = qu[cnt--, head++], d = dd[i] + 1;
		for (o = 0; o < eo[i]; o++) {
			int j = ej[i][o];

			if (dd[j] > d)
				dd[j] = d, qu[head + cnt++] = j;
		}
	}
	if (head != n)
		return INF;
	ans = 0;
	for (i = 0; i < n; i++)
		ans += dd[i];
	return ans;
}

int main() {
	int n, i, ans;

	scanf("%d", &n);
	for (i = 0; i < n; i++)
		ej[i] = (int *) malloc(2 * sizeof *ej[i]);
	for (i = 0; i < n; i++) {
		int m;

		scanf("%d", &m);
		while (m--) {
			int j;

			scanf("%d", &j), j--;
			append(j, i);
		}
	}
	ans = INF;
	for (i = 0; i < n; i++)
		ans = min(ans, solve(n, i));
	printf("%d\n", ans);
	return 0;
}

Compilation message (stderr)

bosses.c: In function 'append':
bosses.c:14:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   14 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
bosses.c: In function 'main':
bosses.c:49:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
bosses.c:55:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |   scanf("%d", &m);
      |   ^~~~~~~~~~~~~~~
bosses.c:59:4: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |    scanf("%d", &j), j--;
      |    ^~~~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 33 / 33