제출 #375029

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
375029		rainboy	Robots (APIO13_robots)	C11	30 / 100	1569 ms	55428 KiB

robots

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

#define N	500
#define M	500
#define K	9
#define N_	(N * M * K * K)
#define INF	0x3f3f3f3f

int di[] = { -1, 0, 1, 0 };
int dj[] = { 0, 1, 0, -1 };

char cc[N][M + 1]; int dp[N][M][K], n, m, k;

int solve(int i, int j, int h) {
	if (dp[i][j][h] == -1) {
		int h_, i_, j_;

		dp[i][j][h] = -2;
		if (cc[i][j] == 'C')
			h_ = (h + 1) % 4;
		else if (cc[i][j] == 'A')
			h_ = (h + 3) % 4;
		else
			h_ = h;
		i_ = i + di[h_], j_ = j + dj[h_];
		if (i_ >= 0 && i_ < n && j_ >= 0 && j_ < m && cc[i_][j_] != 'x')
			dp[i][j][h] = solve(i_, j_, h_);
		else
			dp[i][j][h] = i * m + j;
	}
	return dp[i][j][h];
}

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

int lt(int i, int j) {
	return dd[i] < dd[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);
	return i;
}

int main() {
	int k, h, i, j, l, r;

	scanf("%d%d%d", &k, &m, &n);
	for (i = 0; i < n; i++)
		scanf("%s", cc[i]);
	for (i = 0; i < n; i++)
		for (j = 0; j < m; j++)
			for (h = 0; h < 4; h++)
				dp[i][j][h] = -1;
	for (i = 0; i < n; i++)
		for (j = 0; j < m; j++)
			for (h = 0; h < 4; h++)
				dp[i][j][h] = cc[i][j] == 'x' ? -2 : solve(i, j, h);
	memset(dd, 0x3f, n * m * k * k * sizeof *dd);
	for (i = 0; i < n; i++)
		for (j = 0; j < m; j++)
			if (isdigit(cc[i][j])) {
				int a, u;

				a = cc[i][j] - '1';
				u = ((i * m + j) * k + a) * k + a;
				dd[u] = 0, pq_add_last(u);
			}
	while (cnt) {
		int u = pq_remove_first(), v, ij, d, l_, r_;

		ij = u / k / k, i = ij / m, j = ij % m, l = u / k % k, r = u % k;
		if (l == 0 && r == k - 1) {
			printf("%d\n", dd[u]);
			return 0;
		}
		for (r_ = r + 1; r_ < k; r_++) {
			v = (ij * k + l) * k + r_, d = dd[u] + dd[(ij * k + r + 1) * k + r_];
			if (dd[v] > d) {
				if (dd[v] == INF)
					pq_add_last(v);
				dd[v] = d, pq_up(v);
			}
		}
		for (l_ = l - 1; l_ >= 0; l_--) {
			v = (ij * k + l_) * k + r, d = dd[(ij * k + l_) * k + l - 1] + dd[u];
			if (dd[v] > d) {
				if (dd[v] == INF)
					pq_add_last(v);
				dd[v] = d, pq_up(v);
			}
		}
		for (h = 0; h < 4; h++)
			if (dp[i][j][h] != -2) {
				v = (dp[i][j][h] * k + l) * k + r, d = dd[u] + 1;
				if (dd[v] > d) {
					if (dd[v] == INF)
						pq_add_last(v);
					dd[v] = d, pq_up(v);
				}
			}
	}
	printf("-1\n");
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

robots.c: In function 'main':
robots.c:77:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   77 |  scanf("%d%d%d", &k, &m, &n);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
robots.c:79:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   79 |   scanf("%s", cc[i]);
      |   ^~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40