#include <bits/stdc++.h>
#define pb push_back
#define MOD(var, M) (((var) >= (M)) ? ((var) - M) : (var))
using namespace std;
const int MAXN = 500;
int N, K;
bool adj_list[MAXN][MAXN];
// dp[l][r][k]: Maximum number of stages if enclosed by l, r
// and being in the stages such that l < s < r'
// Where r' = l > r ? r = r + N : r
// k == 0: Starting in l
// k == 1: Starting in r
int dp[MAXN][MAXN][2];
// first[l][r][k]: True iff the first path in dp[l][r][k] is (l, r) or (r, l) respectively
// Before the intersection with the first stage
// You can only choose one way to follow
// Either from l to r or from r to l
int bef[MAXN][MAXN][2];
// True if a stage can be organized from i to j
bool stage(int i, int j)
{
return adj_list[i][j];
}
int main(void)
{
scanf("%d %d", &N, &K);
for (int i = 0; i < N; i++) {
int v;
scanf("%d", &v);
while (v != 0) {
v--;
adj_list[i][v] = true;
scanf("%d", &v);
}
}
int ans = 0;
int starting = 0;
for (int len = 1; len <= N; len++) {
for (int l = 0; l < N; l++) {
int r_actual = l + len - 1;
int r = MOD(r_actual, N);
for (int i_actual = l + 1; i_actual < r_actual; i_actual++) {
int i = MOD(i_actual, N);
dp[l][r][0] = max(dp[l][r][0], dp[l][i][0]);
dp[l][r][1] = max(dp[l][r][1], dp[i][r][1]);
if (stage(l, i)) {
dp[l][r][0] = max(dp[l][r][0], 1 + dp[i][r][0]);
}
if (stage(r, i)) {
dp[l][r][1] = max(dp[l][r][1], 1 + dp[l][i][1]);
}
}
if (stage(l, r)) {
int res = 1 + dp[MOD(l + 1, N)][r][1];
if (res >= dp[l][r][0]) {
// first[l][r][0] = true;
dp[l][r][0] = res;
}
}
if (stage(r, l)) {
int res = 1 + dp[l][MOD(r_actual - 1, N)][0];
if (res >= dp[l][r][1]) {
// first[l][r][1] = true;
dp[l][r][1] = res;
}
}
if (dp[l][r][0] > ans) {
ans = dp[l][r][0];
starting = l;
}
if (dp[l][r][1] > ans) {
ans = dp[l][r][1];
starting = r;
}
}
}
printf("%d\n%d\n", ans, starting + 1);
return 0;
}
Compilation message
race.cpp: In function 'int main()':
race.cpp:36:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
36 | scanf("%d %d", &N, &K);
| ~~~~~^~~~~~~~~~~~~~~~~
race.cpp:40:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
40 | scanf("%d", &v);
| ~~~~~^~~~~~~~~~
race.cpp:45:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
45 | scanf("%d", &v);
| ~~~~~^~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
348 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 3 |
Incorrect |
1 ms |
344 KB |
Output isn't correct |
| 4 |
Incorrect |
1 ms |
604 KB |
Output isn't correct |
| 5 |
Correct |
1 ms |
604 KB |
Output is correct |
| 6 |
Incorrect |
1 ms |
604 KB |
Output isn't correct |
| 7 |
Correct |
3 ms |
760 KB |
Output is correct |
| 8 |
Incorrect |
2 ms |
604 KB |
Output isn't correct |
| 9 |
Correct |
4 ms |
604 KB |
Output is correct |
| 10 |
Correct |
3 ms |
860 KB |
Output is correct |
| 11 |
Correct |
6 ms |
860 KB |
Output is correct |
| 12 |
Incorrect |
21 ms |
1116 KB |
Output isn't correct |
| 13 |
Incorrect |
52 ms |
1752 KB |
Output isn't correct |
| 14 |
Correct |
120 ms |
2188 KB |
Output is correct |
| 15 |
Incorrect |
261 ms |
2396 KB |
Output isn't correct |
| 16 |
Incorrect |
296 ms |
2628 KB |
Output isn't correct |
| 17 |
Incorrect |
265 ms |
2644 KB |
Output isn't correct |
| 18 |
Correct |
210 ms |
2392 KB |
Output is correct |
| 19 |
Incorrect |
363 ms |
2620 KB |
Output isn't correct |
| 20 |
Incorrect |
324 ms |
2392 KB |
Output isn't correct |
