Submission #206432

#TimeUsernameProblemLanguageResultExecution timeMemory
206432autumn_eelShortcut (IOI16_shortcut)C++14
31 / 100
2084 ms632 KiB
#include "shortcut.h"
#include <bits/stdc++.h>
#define rep(i,n)for(int i=0;i<(n);i++)
using namespace std;
typedef long long ll;

ll L[5000],L2[5000],R[5000],R2[5000];
ll sum[5000];

long long find_shortcut(int n, std::vector<int> l, std::vector<int> d, int c)
{
	memset(L,0,sizeof(L));
	memset(L2,0,sizeof(L2));
	memset(R,0,sizeof(R));
	memset(R2,0,sizeof(R2));
	assert(n<=500);
	rep(i,n){
		if(i){
			L[i]=L[i-1]+l[i-1];
			L2[i]=max(L2[i-1],L[i]+d[i]);
		}
		L[i]=max(L[i],(ll)d[i]);
		L2[i]=max(L2[i],(ll)d[i]);
	}
	for(int i=n-1;i>=0;i--){
		if(i<n-1){
			R[i]=R[i+1]+l[i];
			R2[i]=max(R2[i+1],R[i]+d[i]);
		}
		R[i]=max(R[i],(ll)d[i]);
		R2[i]=max(R2[i],(ll)d[i]);
	}
	rep(i,n-1)sum[i+1]=sum[i]+l[i];
	ll Min=L2[n-1];
	rep(i,n)for(int j=i+1;j<n;j++){
		ll Max=max({L2[i],R2[j],L[i]+c+R[j]});
		for(int k=i+1;k<j;k++){
			Max=max(Max,L[i]+min(c+(sum[j]-sum[k]),sum[k]-sum[i])+d[k]);
			Max=max(Max,R[j]+min(c+(sum[k]-sum[i]),sum[j]-sum[k])+d[k]);
		}
		int s=i+1;
		ll M=LLONG_MIN;
		multiset<ll>se;
		for(int k=i+1;k<j;k++){
			while(s<k&&(sum[j]-sum[k])+c+(sum[s]-sum[i])<=(sum[k]-sum[s])){
				M=max(M,c+(sum[s]-sum[i])+d[s]);
				se.erase(se.find(d[s]-sum[s]));
				s++;
			}
			Max=max(Max,M+d[k]+(sum[j]-sum[k]));
			if(!se.empty())Max=max(Max,*se.rbegin()+sum[k]+d[k]);
			se.insert(d[k]-sum[k]);
		}
		Min=min(Min,Max);
	}
    return Min;
}

#include <bits/stdc++.h>
using namespace std;
using ll=long long;
const ll INF=1LL<<60;
long long find_shortcut2(int n, std::vector<int> l, std::vector<int> d, int c)
{
	vector<ll> sum(n);
	for(int i=0;i+1<n;i++){
		sum[i+1]=sum[i]+l[i];
	}
	ll mi=INF;
	auto dist=[&](int u,int v){return u<v?sum[v]-sum[u]:sum[u]-sum[v];};
	for(int i=0;i<n;i++){
		for(int j=i+1;j<n;j++){
			ll ma=0;
			for(int k=0;k<n;k++){
				for(int l=k+1;l<n;l++){
					ll s=d[k]+d[l]+dist(k,l);
					s=min(s,dist(i,k)+dist(j,l)+c+d[k]+d[l]);
					ma=max(ma,s);
				}
			}
			mi=min(mi,ma);
		}
	}
	return mi;
}
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...