Submission #290730

#	Time	Username	Problem	Language	Result	Execution time	Memory
290730		AKaan37	Dreaming (IOI13_dreaming)	C++17	18 / 100	95 ms	28152 KiB

dreaming

//Bismillahirrahmanirrahim
#include "dreaming.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long lo;
typedef pair< int,int > PII;

#define fi first
#define se second
#define mp make_pair
#define endl "\n"
#define pb push_back
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=0;i<n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)

const lo inf = 2000000000;
const lo KOK = 100000;
const lo LOG = 30;
const lo li = 500005;
const lo mod = 1000000007;

int n,m,b[li],a[li],k,flag,t,co[li],vis[li],mx[li],mn;
int cev;
string s;
vector<PII> v[li];
vector<int> vec;
//~ int A[li],B[li],T[li];

inline void dfs(int node,int ata){
	vis[node]=1;
	int mx1=0,mx2=0;
	for(int i=0;i<(int)v[node].size();i++){
		int go=v[node][i].fi;
		if(go==ata)continue;
		dfs(go,node);
		co[node]=max(co[node],co[go]+v[node][i].se);
		mx2=max(mx2,co[go]+v[node][i].se);
		if(mx2>mx1)swap(mx1,mx2);
	}
	cev=max(cev,mx1+mx2);
	//~ cout<<node<<endl;
	mx[node]=max(mx[node],co[node]);
}

inline void dfs1(int node,int ata,int der){
	vis[node]=1;
	multiset<int> st;
	for(int i=0;i<(int)v[node].size();i++){
		int go=v[node][i].fi;
		if(go==ata)continue;
		st.insert(co[go]+v[node][i].se);
	}
	int der1=der;
	int mx1=0;
	int mx2=0;
	for(int i=0;i<(int)v[node].size();i++){
		int go=v[node][i].fi;
		if(go==ata)continue;
		auto it=st.end();
		it--;
		if(*it==co[go]+v[node][i].se){
			if(it!=st.begin()){
				it--;
				der1=max(der1,*it);
			}
		}
		else der1=max(der1,*it);
		mx2=max(mx2,co[go]);
		if(mx2>mx1)swap(mx2,mx1);
		dfs1(go,node,der1+v[node][i].se);
	}
	mx2=max(mx2,der);
	if(mx2>mx1)swap(mx2,mx1);
	mx[node]=max(mx[node],mx2+mx1);
	//~ cev=max(cev,mx[node]);
	mn=min(mn,mx[node]);
}

int travelTime(int n, int m, int l, int A[], int B[], int T[]) {
    for(int i=0;i<m;i++){
		v[A[i]].pb({B[i],T[i]});
		v[B[i]].pb({A[i],T[i]});
	}
    FOR{
		if(vis[i])continue;
		mn=inf;
		dfs(i,-1);
		dfs1(i,-1,0);
		vec.pb(mn);
	}
	sort(vec.begin(),vec.end());
	reverse(vec.begin(),vec.end());
	//~ for(int i=0;i<(int)vec.size();i++)cout<<vec[i]<<endl;
	for(int i=1;i<(int)vec.size();i++){
		cev=max(cev,vec[0]+vec[i]+l);
	}
	for(int i=2;i<(int)vec.size();i++){
		cev=max(cev,vec[1]+vec[i]+2*l);
	}
	return cev;
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 10
• Subtask 3: 0 / 23
• Subtask 4: 18 / 18
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23