#include<iostream>
#include<vector>
#include<map>
#include<set>
#include<cassert>
#include<cassert>
#include<unordered_map>
#include<unordered_set>
#include<functional>
#include<queue>
#include<stack>
#include<cstring>
#include<algorithm>
#include<cmath>
#include<sstream>
#include<iomanip>
#include<cstdio>
#include<cstdlib>
#include<numeric>
#include<random>
#include<chrono>
#include<bitset>
using namespace std;
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define xx first
#define yy second
#define sz(x) (int)(x).size()
#define gc getchar
#define IO ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#define mp make_pair
#ifndef ONLINE_JUDGE
# define LOG(x) (cerr << #x << " = " << (x) << endl)
#else
# define LOG(x) ((void)0)
#endif
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
const double PI=3.1415926535897932384626433832795;
const ll INF = 1LL<<62;
const ll MINF = -1LL<<62;
template<typename T> T getint() {
T val=0;
char c;
bool neg=false;
while((c=gc()) && !(c>='0' && c<='9')) {
neg|=c=='-';
}
do {
val=(val*10)+c-'0';
} while((c=gc()) && (c>='0' && c<='9'));
return val*(neg?-1:1);
}
//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); uniform_int_distribution<int>(0, n-1)(rng)
inline bool between(int i, int j, int k) {
if(i<=k) {
return i<=j && j<=k;
}
//i>k
return j<=k || i<=j;
}
vector<int> adj[501];
int dp0[501][501][2];
int calc0(int i, int j, int b) {
if(dp0[i][j][b]!=-1) return dp0[i][j][b];
int ans=0;
for(int k:adj[(b==0?i:j)]) {
if(i==k || j==k) continue ;
if(between(i,k,j)) {
//cerr<<(b==0?i:j)+1<<" -> "<<k+1<<"\n";
ans=max(ans, max(calc0(i,k,1), calc0(k,j,0))+1);
}
}
//cerr<<i+1<<" "<<j+1<<" "<<b<<" -> "<<ans<<"\n";
return dp0[i][j][b]=ans;
}
int dp[501];
bitset<501> calced;
int from,to,fordit;
int calc(int i) {
if(calced[i]) return dp[i];
int ans=0;
for(auto k:adj[i]) {
if(k==from || k==to) continue;
if(between((!fordit?from:to), k, (!fordit?to:from))) {
if((fordit && between(i,k,from)) || (!fordit && between(from,k,i))) {
ans=max(ans, calc(k)+1);
}
}else if(i!=to){
/*cerr<<to+1<<" "<<k+1<<" "<<1<<"??\n";
cerr<<k+1<<" "<<from+1<<" "<<0<<"??\n";
cerr<<calc0(to,k,1)<<"\n";
cerr<<calc0(k,from,0)<<"\n";*/
//cerr<<i+1<<" -> "<<k+1<<"\n";
if(!fordit) {
ans=max(ans, max(calc0(to,k,1), calc0(k,from,0))+1);
}else {
ans=max(ans, max(calc0(k,to,0), calc0(from,k,1))+1);
}
}
}
calced[i]=1;
return dp[i]=ans;
}
int main() {
IO;
memset(dp0, -1, sizeof dp0);
int n,k;
cin>>n>>k;
for(int i=0;i<n;++i) {
int akt;
do {
cin>>akt;
if(akt==0) break ;
adj[i].pb(akt-1);
//cerr<<i+1<<" "<<akt<<"\n";
}while(akt>0);
}
//assert(k==0);
//cerr<<calc0(5,2,1)<<"\n";
//return 0;
int ans=0, ind=0;
//cerr<<calc0(6,0,0)<<"?!?!?!!\n";
//return 0;
for(int i=0;i<n;++i) {
for(auto j:adj[i]) {
//cerr<<i+1<<","<<j+1<<" -> "<<calc0(i,j,1)<<"\n";
if(ans<calc0(i,j,1)+1) {
ind=i;
ans=calc0(i,j,1)+1;
}
if(ans<calc0(j,i,0)+1) {
ind=i;
ans=calc0(j,i,0)+1;
}
}
}
if(k==1) {
for(int i=0;i<n;++i) {
for(auto j:adj[i]) {
if(ans>=calc0(i,j,1)+calc0(j,i,0)+12) {
continue ;
}
//int i=0,j=4;
calced.reset();
from=i;
to=j;
fordit=0;
if(ans<calc(to)+1) {
ans=calc(to)+1;
ind=from;
}
fordit=1;
calced[to]=0;
dp[to]=-1;
if(ans<calc(to)+1) {
//cerr<<calc0(i,j,1)+calc0(j,i,0)<<" "<<ans<<"\n";
ans=calc(to)+1;
ind=from;
}
}
}
}
cout<<ans<<"\n"<<ind+1<<"\n";
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
2304 KB |
Output is correct |
| 2 |
Correct |
3 ms |
2304 KB |
Output is correct |
| 3 |
Correct |
4 ms |
2432 KB |
Output is correct |
| 4 |
Correct |
4 ms |
2304 KB |
Output is correct |
| 5 |
Correct |
4 ms |
2304 KB |
Output is correct |
| 6 |
Correct |
9 ms |
2304 KB |
Output is correct |
| 7 |
Correct |
6 ms |
2304 KB |
Output is correct |
| 8 |
Correct |
9 ms |
2304 KB |
Output is correct |
| 9 |
Correct |
7 ms |
2304 KB |
Output is correct |
| 10 |
Correct |
15 ms |
2304 KB |
Output is correct |
| 11 |
Correct |
9 ms |
2304 KB |
Output is correct |
| 12 |
Correct |
272 ms |
2424 KB |
Output is correct |
| 13 |
Correct |
230 ms |
2428 KB |
Output is correct |
| 14 |
Correct |
59 ms |
2424 KB |
Output is correct |
| 15 |
Correct |
2208 ms |
2544 KB |
Output is correct |
| 16 |
Correct |
1766 ms |
2560 KB |
Output is correct |
| 17 |
Execution timed out |
3043 ms |
2432 KB |
Time limit exceeded |
| 18 |
Correct |
76 ms |
2428 KB |
Output is correct |
| 19 |
Correct |
2605 ms |
2560 KB |
Output is correct |
| 20 |
Execution timed out |
3019 ms |
2560 KB |
Time limit exceeded |
