Submission #412386

#	Time	Username	Problem	Language	Result	Execution time	Memory
412386		rainboy	Saveit (IOI10_saveit)	C11	50 / 100	391 ms	12684 KiB

encoder

#include "grader.h"
#include "encoder.h"
#include <stdlib.h>

#define N	1000

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;
}

void bfs(int n, int s) {
	static int dd[N], qu[N];
	int i, g, head, cnt;

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

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

			if (dd[j] > d)
				dd[j] = d, qu[head + cnt++] = j;
		}
	}
	for (i = 0; i < n; i++)
		for (g = 0; g < 10; g++)
			encode_bit(dd[i] >> g & 1);
}

void encode(int n, int k, int m, int *ii, int *jj) {
	int h, i;

	for (i = 0; i < n; i++)
		ej[i] = (int *) malloc(2 * sizeof *ej[i]);
	for (h = 0; h < m; h++)
		append(ii[h], jj[h]), append(jj[h], ii[h]);
	for (i = 0; i < k; i++)
		bfs(n, i);
}

decoder

#include "grader.h"
#include "decoder.h"

void decode(int n, int k) {
	int g, i, j;

	for (i = 0; i < k; i++)
		for (j = 0; j < n; j++) {
			int d = 0;

			for (g = 0; g < 10; g++)
				if (decode_bit())
					d |= 1 << g;
			hops(i, j, d);
		}
}

Compilation message (stderr)

encoder.c: In function 'append':
encoder.c:12:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   12 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~

• Subtask 1: 25 / 25
• Subtask 2: 25 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25