제출 #407397

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
407397		rainboy	Domino (COCI15_domino)	C11	100 / 160	4062 ms	524292 KiB

domino

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

#define N	2000
#define N_	(2 + N * N + 1)
#define M_	(1 + N * N + N * (N - 1) * 2)
#define A	1000
#define INF	0x3f3f3f3f

int ii[M_], jj[M_], ww[M_], ww_[M_], cc[M_ * 2], m_;
int *eh[N_], eo[N_], n_;

void append(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;
}

void add(int i, int j, int c, int w) {
	int h = m_++;

	ii[h] = i, jj[h] = j, ww[h] = w, cc[h << 1 | 0] = c;
	append(i, h << 1 | 0), append(j, h << 1 | 1);
}

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

int lt(int i, int j) {
	return dd[i] < dd[j] || dd[i] == dd[j] && kk[i] < kk[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 dijkstra(int s, int t) {
	memset(dd, 0x3f, n_ * sizeof *dd);
	dd[s] = 0, kk[s] = 0, pq_add_last(s);
	while (cnt) {
		int i = pq_remove_first(), k = kk[i] + 1, o;

		for (o = eo[i]; o--; ) {
			int h_ = eh[i][o];

			if (cc[h_]) {
				int h = h_ >> 1, j = i ^ ii[h] ^ jj[h], d = dd[i] + ((h_ & 1) == 0 ? ww_[h] : -ww_[h]);

				if (dd[j] > d || dd[j] == d && kk[j] > k) {
					if (dd[j] == INF)
						pq_add_last(j);
					ff[j] = h_, dd[j] = d, kk[j] = k, pq_up(j);
				}
			}
		}
	}
	return dd[t] != INF;
}

void trace(int s, int t) {
	while (t != s) {
		int h_ = ff[t], h = h_ >> 1;

		cc[h_]--, cc[h_ ^ 1]++;
		t ^= ii[h] ^ jj[h];
	}
}

int edmonds_karp(int s, int t) {
	int h, w;

	memcpy(ww_, ww, m_ * sizeof *ww);
	while (dijkstra(s, t)) {
		trace(s, t);
		for (h = 0; h < m_; h++) {
			int i = ii[h], j = jj[h];

			if (dd[i] != INF && dd[j] != INF)
				ww_[h] += dd[i] - dd[j];
		}
	}
	w = 0;
	for (h = 0; h < m_; h++)
		w += ww[h] * cc[h << 1 | 1];
	return w;
}

int main() {
	int n, k, i, j, sum;

	scanf("%d%d", &n, &k), n_ = 2 + n * n + 1;
	for (i = 0; i < n_; i++)
		eh[i] = (int *) malloc(2 * sizeof *eh[i]);
	add(0, 1, k, 0);
	sum = 0;
	for (i = 0; i < n; i++)
		for (j = 0; j < n; j++) {
			int a;

			scanf("%d", &a);
			sum += a;
			if ((i + j) % 2 == 0)
				add(1, 2 + i * n + j, 1, A - a);
			else
				add(2 + i * n + j, n_ - 1, 1, A - a);
		}
	for (i = 0; i < n; i++)
		for (j = i % 2; j < n; j += 2) {
			if (i > 0)
				add(2 + i * n + j, 2 + (i - 1) * n + j, 1, 0);
			if (i + 1 < n)
				add(2 + i * n + j, 2 + (i + 1) * n + j, 1, 0);
			if (j > 0)
				add(2 + i * n + j, 2 + i * n + (j - 1), 1, 0);
			if (j + 1 < n)
				add(2 + i * n + j, 2 + i * n + (j + 1), 1, 0);
		}
	printf("%d\n", sum + edmonds_karp(0, n_ - 1) - A * k * 2);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

domino.c: In function 'append':
domino.c:17:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   17 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
domino.c: In function 'lt':
domino.c:32:41: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   32 |  return dd[i] < dd[j] || dd[i] == dd[j] && kk[i] < kk[j];
      |                          ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
domino.c: In function 'dijkstra':
domino.c:80:33: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   80 |     if (dd[j] > d || dd[j] == d && kk[j] > k) {
      |                      ~~~~~~~~~~~^~~~~~~~~~~~
domino.c: In function 'main':
domino.c:122:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  122 |  scanf("%d%d", &n, &k), n_ = 2 + n * n + 1;
      |  ^~~~~~~~~~~~~~~~~~~~~
domino.c:131:4: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  131 |    scanf("%d", &a);
      |    ^~~~~~~~~~~~~~~

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