#include <bits/stdc++.h>
// #pragma GCC optimize("O3, unroll-loops")
// #pragma GCC target("avx2")
// #define int long long
using namespace std;
#define _upgrade \
ios_base::sync_with_stdio(0); \
cin.tie(0); \
cout.tie(0);
#define LINE "---------------------\n"
#define ALL(A) A.begin(), A.end()
#define LLA(A) A.rbegin(), A.rend()
#define Q queue
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define lb lower_bound
#define ub upper_bound
#define ub upper_bound
#define sz(x) (int)x.size()
#define chmin(a,b) a=min(a,b)
#define chmax(a,b) a=max(a,b)
using db = double;
using ld = long double;
using sint = short int;
using ll = long long;
using uint = unsigned int;
// PQ going up <int, VI, greater<int> >
using VI = vector<int>;
using VVI = vector<VI>;
using VVVI = vector<VVI>;
using VB = vector<bool>;
using VVB = vector<VB>;
using VVVB = vector<VVB>;
using VLL = vector<ll>;
using VVLL = vector<VLL>;
using PII = pair<int, int>;
using VPI = vector<PII>;
using VVPI = vector<VPI>;
using PLL = pair<ll, ll>;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int strToInt(string&a) {
stringstream x(a);
int b;
x >> b;
return b;
}
int gcd(int a, int b) {
if (b == 0) return a;
return gcd(b, a % b);
}
/*
| _
| __ _ | |
| | \| | ___ ___ | |_
| | |\ | |/ _ \/ __/| __|
| | | \ | __/\__ \| |_
| |_| \_|\___ /___/ \__|
| _ _ _
| (_) | | | |
| _ __ _ __ ___ __ _ _ __ __ _ _ __ ___ _ __ ___ _ ___ ___| |_| |_
| | '_ \| '__/ _ \ / _` | '__/ _` | '_ ` _ \| '_ ` _ \| / __/ __| __| __|
| | |_) | | | (_) | (_| | | | (_| | | | | | | | | | | | \__ \__ \ |_| |_
| | .__/|_| \___/ \__, |_| \__,_|_| |_| |_|_| |_| |_|_|___/___/\__|\__|
| | | __/ |
| |_| |___/ _
| _ (_)
| _ __ ___ __ _ ____ __ _ __ _| | __ _ _
| | '_ ` _ \ / _` |_ / _` |/ _` | |/ _` | |
| | | | | | | (_| / / (_| | (_| | | (_| | |
| |_| |_| |_|\__,_|____\__,_|\__,_|_|\__,_|_|
*/
const db PI = acos(-1.0); //M_PI;
const ll INFF = 4e18;
const int INF = 1.07e9;
const int MOD = 1e9 + 7;
const int MOD1 = 998244353; //7*19*2^23 +1;
const int dx[] = {-1, 0, 1, 0, -1, -1, 1, 1};
const int dy[] = {0, 1, 0, -1, -1, 1, -1, 1};
const int N = 500 + 5;
const int M = 2e5 + 5;
int nums[N];
int n, m, k, q, type;
string s;
bool edge[N][N];
int dp[N][N][2]; // dp[i][j] started at I and ended at j;
int dp1[N][N][2];
int nx[N][2];
void solve(int l, int r, int x) {
if (edge[l][r]) {
dp[l][r][x] = 1;
dp1[l][r][x] = 1 + dp1[r][nx[l][x]][x^1];
} else {
dp[l][r][x] = dp1[l][r][x] = -N;
}
for (int m = nx[l][x]; m != r; m=nx[m][x]) {
chmax(dp[l][r][x], dp[l][m][x]+dp[m][r][x]);
chmax(dp1[l][r][x], dp[l][m][x]+dp1[m][r][x]);
}
chmax(dp1[l][r][x], dp1[l][nx[r][x^1]][x]);
}
void go () {
cin >> n >> type;
for (int i = 0, x; i < n; i++) {
while(cin >> x && x-- != 0) edge[i][x] = 1;
nx[i][0] = (i+1)%n;
nx[i][1] = (i+n-1)%n;
}
for (int d = 1; d < n; d++)
for (int l = 0, r = (l+d)%n; l < n; l++, r=nx[r][0]) {
solve(l, r, 0);
solve(r, l, 1);
}
PII ans = {-1, 0};
for (int l = 0; l < n; l++)
for (int r = 0; r < n; r++)
for (int x = 0; x < 2; x++) {
chmax(ans, mp(dp1[l][r][x], l+1));
}
// type = 0;
if (type) {
for (int l = 0; l < n; l++)
for (int r = 0; r < n; r++)
for (int x = 0; x < 2; x++) {
if (dp[l][r][x] <= 0) continue;
int st = nx[r][x];
while (st != l && !edge[st][l]) st = nx[st][x];
if (st == l) continue;
for (int ed = nx[st][x]; ed != l; ed=nx[ed][x]) {
if (edge[r][ed]) {
int curAdd = max(dp1[ed][nx[st][x]][x^1], dp1[ed][nx[l][x^1]][x]);
chmax(ans, mp(1 + dp[l][r][x] + 1 + curAdd, st+1));
}
}
}
}
cout << ans.ff << '\n' << ans.ss << '\n';
}
signed main () {
#ifndef ONLINE_JUDGE
// freopen("0.in", "r", stdin);
// freopen("0.out", "w", stdout);
#endif
_upgrade
int T = 1;
while(T--) go();
return (0-0); //<3
}
/* stuff you should look for
* int overflow, array bounds
* special cases (n=1?)
*/
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 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 |
1 ms |
724 KB |
Output is correct |
| 6 |
Correct |
2 ms |
852 KB |
Output is correct |
| 7 |
Correct |
2 ms |
852 KB |
Output is correct |
| 8 |
Correct |
4 ms |
980 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1108 KB |
Output is correct |
| 10 |
Correct |
5 ms |
1108 KB |
Output is correct |
| 11 |
Correct |
4 ms |
1108 KB |
Output is correct |
| 12 |
Correct |
54 ms |
2040 KB |
Output is correct |
| 13 |
Correct |
156 ms |
2772 KB |
Output is correct |
| 14 |
Correct |
213 ms |
3720 KB |
Output is correct |
| 15 |
Correct |
805 ms |
4636 KB |
Output is correct |
| 16 |
Correct |
865 ms |
4664 KB |
Output is correct |
| 17 |
Correct |
831 ms |
4636 KB |
Output is correct |
| 18 |
Correct |
408 ms |
4564 KB |
Output is correct |
| 19 |
Correct |
907 ms |
4692 KB |
Output is correct |
| 20 |
Correct |
914 ms |
4696 KB |
Output is correct |
