Submission #1232213

#	Time	Username	Problem	Language	Result	Execution time	Memory
1232213		cpdreamer	Shortcut (IOI16_shortcut)	C++20	0 / 100	0 ms	328 KiB

shortcut

#include "shortcut.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
const long long INF = 1e17;
typedef long long ll;
const ll MOD = 1000002022;
#define F first
#define P pair
#define S second
#define pb push_back
#define V vector
#define all(v) v.begin(), v.end()

long long find_shortcut(int n, std::vector <int> l, std::vector <int> d, int c) {
    ll cst=c;
    ll pref[n];
    pref[0]=0;
    ll f1[n],f2[n];
    f1[0]=0LL,f2[n-1]=0LL;
    for (int i=1;i<n;i++) {
        pref[i]=pref[i-1]+l[i-1];
    }
    ll md[n],mx [n];
    md[0]=pref[0]-d[0];
    mx[n-1]=pref[n-1]+d[n-1];
    for (int i=1;i<n;i++) {
        md[i]=min(md[i-1],pref[i]-d[i]);
    }
    for (int i=n-2;i>=0;--i) {
        mx[i]=max(mx[i+1],pref[i]+d[i]);
    }
    for (int i=1;i<n;i++) {
        f1[i]=max(f1[i-1],pref[i]+d[i]-md[i-1]);
    }
    for (int i=n-2;i>=0;i--) {
        f2[i]=max(f2[i+1],mx[i+1]-(pref[i]-d[i]));
    }
    ll ans=f1[n-1];
    for (int i=0;i<n;i++) {
        ll maxd=0,mind=INF;
        ll mx1=0,mn1=INF;
        ll z=0;
        for (int j=i+1;j<n;j++) {
            if (i-1>0) {
                z=max(z,mx1-md[i-1]);
            }
            if (j+1<n) {
                z=max(z,mx[j+1]-mn1);
            }
            ll x=max(maxd,pref[j]+d[j]-mind);
            ll y=mx[j]-md[i]-(pref[j]-pref[i])+cst;
            ll a=max(x,max(y,z));
            ll b=max(f1[i],f2[j]);
            ans=min(ans,max(a,b));
            maxd=max(maxd,pref[j]-pref[i]+d[j]+d[i]);
            maxd=max(maxd,pref[j]+d[j]-mind);
            mind=min(mind,pref[j]-d[j]);
            mx1=max(mx1,pref[j]+d[j]);
            mn1=min(mn1,pref[j]-d[j]);
        }
    }
    return ans;
}

Compilation message (stderr)

shortcut.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~
shortcut_c.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~

• 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