#include <ctype.h>
#include <stdio.h>
#include <string.h>
#define N 500
#define M 500
#define K 9
#define N_ ((N + M) * 2 * 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)
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;
}
void b2ij(int b, int *i, int *j) {
if (b < m)
*i = 0, *j = b;
else if ((b -= m) < m)
*i = n - 1, *j = b;
else if ((b -= m) < n)
*i = b, *j = 0;
else
*i = 0, *j = b - n;
}
int ij2b(int i, int j) {
if (i == 0)
return j;
else if (i == n - 1)
return m + j;
else if (j == 0)
return m + m + i;
else
return m + m + n + 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++)
solve(i, j, h);
memset(dd, 0x3f, ((n + m) * 2 * k * k) * sizeof *dd);
for (i = 0; i < n; i++)
for (j = 0; j < m; j++)
if (isdigit(cc[i][j])) {
int a, b, d, u;
a = cc[i][j] - '1';
if (i == 0 || i == n - 1 || j == 0 || j == m - 1) {
u = (ij2b(i, j) * k + a) * k + a, d = 0;
if (dd[u] > d) {
if (dd[u] == INF)
pq_add_last(u);
dd[u] = d, pq_up(u);
}
} else
for (h = 0; h < 4; h++) {
b = ij2b(dp[i][j][h] / m, dp[i][j][h] % m), u = (b * k + a) * k + a, d = 1;
if (dd[u] > d) {
if (dd[u] == INF)
pq_add_last(u);
dd[u] = d, pq_up(u);
}
}
}
while (cnt) {
int u = pq_remove_first(), b, v, d, l_, r_;
l = u / k % k, r = u % k, b2ij(b = u / k / k, &i, &j);
if (l == 0 && r == k - 1) {
printf("%d\n", dd[u]);
return 0;
}
if (u >= k) {
for (r_ = r + 1; r_ < k; r_++) {
v = (b * k + l) * k + r_, d = dd[u] + dd[(b * 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 = (b * k + l_) * k + r, d = dd[(b * 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) {
b = ij2b(dp[i][j][h] / m, dp[i][j][h] % m), v = (b * 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;
}
Compilation message
robots.c: In function 'main':
robots.c:99:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
99 | scanf("%d%d%d", &k, &m, &n);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
robots.c:101:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
101 | scanf("%s", cc[i]);
| ^~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
364 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
364 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
364 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
364 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
