#include <stdio.h>
#include <string.h>
#define N 500
#define add(x) (x + 1 == n ? 0 : x + 1)
#define sub(x) (x == 0 ? n - 1 : x - 1)
int max(int a, int b) { return a > b ? a : b; }
int main() {
static int aa[N][N], dp[N][N], dq[N][N], dr[N][N], ds[N][N], dt[N];
int n, t, i, i_, j, k, l, x_;
scanf("%d%d", &n, &t);
for (i = 0; i < n; i++)
while (1) {
scanf("%d", &j), j--;
if (j == -1)
break;
aa[i][j] = 1;
}
for (i = 0; i < n; i++) {
memset(dp[i], -1, n * sizeof *dp[i]);
dp[i][i] = 0;
j = i;
do {
int x = dp[i][j];
if (x != -1)
for (k = add(j); k != i; k = add(k))
if (aa[j][k])
dp[i][k] = max(dp[i][k], x + 1);
j = add(j);
} while (j != i);
memset(dq[i], -1, n * sizeof *dq[i]);
dq[i][i] = 0;
j = i;
do {
int x = dq[i][j];
if (x != -1)
for (k = sub(j); k != i; k = sub(k))
if (aa[j][k])
dq[i][k] = max(dq[i][k], x + 1);
j = sub(j);
} while (j != i);
}
for (l = 1; l < n; l++)
for (i = 0; i < n; i++) {
int x;
j = (i + l) % n;
x = -1, k = add(i);
while (1) {
if (aa[i][k])
x = max(x, max(ds[add(i)][k], dr[j][k]));
if (k == j)
break;
k = add(k);
}
dr[j][i] = x + 1;
x = -1, k = sub(j);
while (1) {
if (aa[j][k])
x = max(x, max(dr[sub(j)][k], ds[i][k]));
if (k == i)
break;
k = sub(k);
}
ds[i][j] = x + 1;
}
x_ = 0, i_ = 0;
for (i = 0; i < n; i++) {
int x = dr[(i - 1 + n) % n][i];
if (x_ < x)
x_ = x, i_ = i;
}
if (t == 1)
for (j = 0; j < n; j++) {
memset(dt, -1, n * sizeof *dt);
for (i = add(j); i != j; i = add(i)) {
if (aa[i][j])
for (k = add(i); k != j; k = add(k))
if (dt[k] != -1) {
int x = 1 + dt[k] + max(dr[sub(j)][k], ds[add(i)][k]);
if (x_ < x)
x_ = x, i_ = i;
}
if (dp[j][i] != -1)
for (k = add(i); k != j; k = add(k))
if (aa[i][k])
dt[k] = max(dt[k], dp[j][i] + 1);
}
memset(dt, -1, n * sizeof *dt);
for (i = sub(j); i != j; i = sub(i)) {
if (aa[i][j])
for (k = sub(i); k != j; k = sub(k))
if (dt[k] != -1) {
int x = 1 + dt[k] + max(ds[add(j)][k], dr[sub(i)][k]);
if (x_ < x)
x_ = x, i_ = i;
}
if (dq[j][i] != -1)
for (k = sub(i); k != j; k = sub(k))
if (aa[i][k])
dt[k] = max(dt[k], dq[j][i] + 1);
}
}
printf("%d\n", x_);
printf("%d\n", i_ + 1);
return 0;
}
Compilation message
race.c: In function 'main':
race.c:14:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
14 | scanf("%d%d", &n, &t);
| ^~~~~~~~~~~~~~~~~~~~~
race.c:17:4: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
17 | scanf("%d", &j), j--;
| ^~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Correct |
1 ms |
468 KB |
Output is correct |
| 3 |
Correct |
1 ms |
596 KB |
Output is correct |
| 4 |
Correct |
1 ms |
596 KB |
Output is correct |
| 5 |
Correct |
2 ms |
676 KB |
Output is correct |
| 6 |
Correct |
3 ms |
852 KB |
Output is correct |
| 7 |
Correct |
4 ms |
980 KB |
Output is correct |
| 8 |
Correct |
4 ms |
1084 KB |
Output is correct |
| 9 |
Correct |
8 ms |
1196 KB |
Output is correct |
| 10 |
Correct |
6 ms |
1236 KB |
Output is correct |
| 11 |
Correct |
10 ms |
1252 KB |
Output is correct |
| 12 |
Correct |
70 ms |
2216 KB |
Output is correct |
| 13 |
Correct |
154 ms |
3252 KB |
Output is correct |
| 14 |
Correct |
209 ms |
4124 KB |
Output is correct |
| 15 |
Correct |
858 ms |
5264 KB |
Output is correct |
| 16 |
Correct |
1020 ms |
5324 KB |
Output is correct |
| 17 |
Correct |
867 ms |
5204 KB |
Output is correct |
| 18 |
Correct |
351 ms |
5168 KB |
Output is correct |
| 19 |
Correct |
1181 ms |
5320 KB |
Output is correct |
| 20 |
Correct |
1183 ms |
5328 KB |
Output is correct |
