#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define ii pair<int, int>
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define all(x) x.begin(), x.end()
#define F0R(i, n) for (int i = 0; i < n; i++)
#define FOR(i, a, b) for (int i = a; i < b; i++)
#define inf 1000000010
#define maxn 500
int n, k;
vector<int> adj[maxn];
vector<int> radj[maxn];
int memo[maxn][maxn][2];
int dp(int x, int y, bool onY) {
if (memo[x][y][onY] != -1) return memo[x][y][onY];
int best = 1;
for (int i : adj[onY ? y : x]) {
bool legal = false;
if (x < y) {
if (x < i && i < y) {
legal = true;
}
} else {
if (i > x || i < y) {
legal = true;
}
}
if (!legal) continue;
best = max(best, 1 + max(dp(x, i, 1), dp(i, y, 0)));
}
return memo[x][y][onY] = best;
}
// path[i][x] = longest path to x starting from i, going counterclockwise
int path[maxn][maxn];
// going clockwise
int pathRev[maxn][maxn];
int main() {
cin.tie(0)->sync_with_stdio(0);
cin >> n >> k;
F0R(i, n) {
int x;
while (cin >> x && x != 0) {
--x;
adj[i].pb(x);
radj[x].pb(i);
}
}
int best = -1, bestIdx = -1;
F0R(i, n) F0R(j, n) F0R(k, 2) memo[i][j][k] = -1;
F0R(i, n) {
path[i][i] = pathRev[i][i] = 1;
}
F0R(i, n) {
for (int j : adj[i]) {
int val = max(dp(i, j, 1), dp(j, i, 0));
if (best < val) {
best = val;
bestIdx = i;
}
}
if (k) {
sort(all(radj[i]), [&i](int x, int y){return (i-x+n)%n-(i-y+n)%n;});
int add = 0;
for (int j : radj[i]) {
//while (add < n && ((i < j && (i+add)%n < j) || (i > j && ((i+add)%n > i || (i+add)%n < j)))) {
while (add < (j-i+n)%n) {
int cur = (i+add)%n;
add++;
if (path[i][cur] == 0) continue;
for (int nxt : adj[cur]) {
if ((cur >= i && (nxt > cur || nxt < i)) || (cur <= i && (cur < nxt && nxt < i))) {
path[i][nxt] = max(path[i][nxt], path[i][cur]+1);
}
}
}
F0R(add, n) {
int tmp = i;
int i = j; int j = tmp;
int cur = (i+add)%n;
int newVal = -1;
int newVal2 = -1;
if ((j > i && (i < cur && cur < j)) || (j < i && (cur > i || cur < j))) {
newVal = path[j][cur] + max(dp(cur, j, 0), dp(i, cur, 1)) - 1;
} else if (cur != i && cur != j) {
newVal2 = pathRev[j][cur] + max(dp(j, cur, 1), dp(cur, i, 0)) - 1;
}
int val = max(newVal, newVal2);
if (best < val) {
best = val;
bestIdx = i;
}
}
}
reverse(all(radj[i]));
int sub = 0;
for (int j : radj[i]) {
while (sub < (i-j+n)%n) {
int cur = (i-sub+n)%n;
//cout << j << "-->" << i << ": processed " << cur << endl;
sub++;
if (pathRev[i][cur] == 0) continue;
for (int nxt : adj[cur]) {
if ((cur >= i && (i < nxt && nxt < cur)) || (cur <= i && (nxt > i || nxt < cur))) {
pathRev[i][nxt] = max(pathRev[i][nxt], pathRev[i][cur]+1);
}
}
}
F0R(add, n) {
int tmp = i;
int i = j; int j = tmp;
int cur = (i+add)%n;
int newVal = -1;
int newVal2 = -1;
if ((j > i && (i < cur && cur < j)) || (j < i && (cur > i || cur < j))) {
newVal = path[j][cur] + max(dp(cur, j, 0), dp(i, cur, 1)) - 1;
} else if (cur != i && cur != j) {
newVal2 = pathRev[j][cur] + max(dp(j, cur, 1), dp(cur, i, 0)) - 1;
}
int val = max(newVal, newVal2);
if (best < val) {
best = val;
bestIdx = i;
}
}
}
}
}
cout << best << endl;
cout << bestIdx+1 << endl;
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
492 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
492 KB |
Output isn't correct |
| 3 |
Incorrect |
1 ms |
620 KB |
Output isn't correct |
| 4 |
Incorrect |
2 ms |
748 KB |
Output isn't correct |
| 5 |
Correct |
1 ms |
748 KB |
Output is correct |
| 6 |
Runtime error |
4 ms |
1644 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 7 |
Correct |
5 ms |
1004 KB |
Output is correct |
| 8 |
Runtime error |
4 ms |
1900 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 9 |
Correct |
6 ms |
1132 KB |
Output is correct |
| 10 |
Correct |
18 ms |
1260 KB |
Output is correct |
| 11 |
Correct |
9 ms |
1260 KB |
Output is correct |
| 12 |
Runtime error |
28 ms |
3948 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 13 |
Runtime error |
20 ms |
5484 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 14 |
Correct |
69 ms |
3820 KB |
Output is correct |
| 15 |
Runtime error |
104 ms |
9196 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 16 |
Runtime error |
138 ms |
9964 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 17 |
Runtime error |
118 ms |
9196 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 18 |
Correct |
86 ms |
4460 KB |
Output is correct |
| 19 |
Runtime error |
178 ms |
9836 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 20 |
Runtime error |
162 ms |
9836 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
