Submission #1187872

#	Time	Username	Problem	Language	Result	Execution time	Memory
1187872		thelegendary08	Cat Exercise (JOI23_ho_t4)	C++17	31 / 100	2097 ms	143196 KiB

Main

#include<bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define int long long
#define vi vector<int>
#define vvi vector<vector<int>>
#define pii pair<int, int>
#define vpii vector<pair<int, int>>
#define vc vector<char>
#define vb vector<bool>
#define mii map<int,int>
#define f0r(i,n) for(int i=0;i<n;i++)
#define FOR(i,k,n) for(int i=k;i<n;i++)
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define in(a) int a; cin>>a
#define in2(a,b) int a,b; cin>>a>>b
#define in3(a,b,c) int a,b,c; cin>>a>>b>>c
#define in4(a,b,c,d) int a,b,c,d; cin>>a>>b>>c>>d
#define vin(v,n); vi v(n); f0r(i,n){cin>>v[i];}
#define out(a) cout<<a<<'\n'
#define out2(a,b) cout<<a<<' '<<b<<'\n'
#define out3(a,b,c) cout<<a<<' '<<b<<' '<<c<<'\n'
#define out4(a,b,c,d) cout<<a<<' '<<b<<' '<<c<<' '<<d<<'\n'
#define pout(a) cout<<a.first<<' '<<a.second<<'\n'
#define vout(v) for(auto u : v){cout<<u<<' ';} cout<<'\n'
#define dout(a) cout<<a<<' '<<#a<<'\n'
#define dout2(a,b) cout<<a<<' '<<#a<<' '<<b<<' '<<#b<<'\n'
#define yn(x); if(x){cout<<"YES"<<'\n';}else{cout<<"NO"<<'\n';}
const int leg = 1e9 + 7;
const int mod = 998244353;
using namespace std;
 
signed main(){
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	//ifstream cin(".in");
	//ofstream cout(".out");
	in(n);
	vin(v,n);
	vvi adj(n);
	f0r(i,n-1){
		in2(a,b);
		a--; b--;
		adj[a].pb(b);
		adj[b].pb(a);
	}
	
	vi numtonode(n);
	f0r(i,n){
		numtonode[v[i] - 1] = i;
	}
	vector<vpii> nxt(n);
	for(int i = n-1; i>=0; i--){
		int cur = numtonode[i];
		queue<pii>q;
		vi dep(n, -4e18);
		vb vis(n);
		dep[cur] = 0;
		q.push(mp(cur,-1));
		vis[cur] = 1;
		for(int j = i+1; j<n; j++){
			vis[numtonode[j]] = 1;
		}
		// vout(vis);
		while(!q.empty()){
			int node = q.front().first;
			int lo = q.front().second;
			q.pop();
			for(auto u : adj[node]){
				if(!vis[u]){
					if(v[u] > lo){
						q.push(mp(u, v[u]));
						dep[u] = dep[node] + 1;
						vis[u] = 1;
						nxt[i].pb(mp(v[u]-1, dep[u]));
					}
					else{
						q.push(mp(u, lo));
						dep[u] = dep[node] + 1;
						vis[u] = 1;
					}
				}
			}
		}
		// vout(dep);
	}
	vi dp(n);
	dp[n-1] = 0;
	for(int i = n-1; i>=0; i--){
		// dout(i);
		for(pii x : nxt[i]){
			// pout(x);
			dp[x.first] = max(dp[x.first], dp[i] + x.second);
		}
		// cout<<'\n';
	}
	
	
	out(*max_element(all(dp)));
}

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 7 / 7
• Subtask 4: 10 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 23
• Subtask 7: 0 / 26