Submission #134776

#	Time	Username	Problem	Language	Result	Execution time	Memory
134776		ckodser	Shortcut (IOI16_shortcut)	C++14	0 / 100	2 ms	504 KiB

shortcut

#include "shortcut.h"
#include<bits/stdc++.h>

#define ll long long
#define pb push_back
#define mp make_pair
#define pii pair<ll,ll>
#define F first
#define S second
#define ld long double

using namespace :: std;
const ll maxn=1e5+500;
const ll inf=1e17+900;

ll pos[maxn];
ll farr[maxn];
ll farl[maxn];
ll dr[maxn];
ll dl[maxn];

long long find_shortcut(int n,vector<int> l,vector<int> d, int c)
{
    pos[0]=0;
    for(ll i=1;i<n;i++){
	pos[i]=pos[i-1]+l[i-1];
    }
    dl[0]=0;
    farl[0]=d[0];
    for(ll i=1;i<n;i++){
	farl[i]=max((ll)d[i],farl[i-1]+l[i-1]);
	dl[i]=max(dl[i-1],farl[i-1]+l[i-1]+d[i]);
    }
    dr[n-1]=0;
    farr[n-1]=d[n-1];
    for(ll i=n-2;i>=0;i--){
    	farr[i]=max((ll)d[i],farr[i+1]+l[i]);
	dr[i]=max(dr[i+1],farr[i+1]+l[i]+d[i]);
    }
    ll ans=dr[0];
    for(ll i=0;i<n;i++){
	for(ll j=i+1;j<n;j++){
	    ll res=max(dr[j],dl[i]);
	    ll sdi=d[i];
	    ll sdj=d[j];
	    d[j]=farr[j];
	    d[i]=farl[i];
	    ll tol=c+pos[j]-pos[i];
	    
	    for(ll u=i;u<=j;u++){
		for(ll v=u+1;v<=j;v++){
		    res=max(res,d[v]+d[u]+min(pos[v]-pos[u],tol-(pos[v]-pos[u])));
		}
	    }
	    ans=min(ans,res);


	    d[j]=sdj;
	    d[i]=sdi;
	}
    }
    return ans;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 14
• Subtask 3: 0 / 8
• Subtask 4: 0 / 7
• Subtask 5: 0 / 33
• Subtask 6: 0 / 22
• Subtask 7: 0 / 4
• Subtask 8: 0 / 3