Submission #900985

#	Time	Username	Problem	Language	Result	Execution time	Memory
900985		abcvuitunggio	Shortcut (IOI16_shortcut)	C++17	71 / 100	2016 ms	4052 KiB

shortcut

#include "shortcut.h"
#include <bits/stdc++.h>
using namespace std;
const long long INF=1e18;
long long s[1000001];
vector <long long> v;
long long find_shortcut(int n, vector <int> l, vector <int> d, int c){
    long long lo=0,hi=INF,kq=-1;
    for (int i=1;i<n;i++){
        s[i]=s[i-1]+l[i-1];
        v.push_back(s[i]);
    }
    sort(v.begin(),v.end());
    while (lo<=hi){
        long long mid=(lo+hi)>>1,ch=0,mnx=-INF,mxx=INF,mny=-INF,mxy=INF;
        for (int i=0;i<n;i++)
            for (int j=i+1;j<n;j++)
                if (s[j]-s[i]+d[i]+d[j]>mid){
                    long long sz=mid-d[i]-d[j]-c,a=s[i],b=s[j]-sz,c=s[i],d=s[j]+sz;
                    mnx=max(mnx,a+b);
                    mxx=min(mxx,c+d);
                    mny=max(mny,c-d);
                    mxy=min(mxy,a-b);
                }
        for (int i=0;i<n;i++){
            long long l=max(mnx-s[i],s[i]-mxy),r=min(mxx-s[i],s[i]-mny);
            int x=lower_bound(v.begin(),v.end(),l)-v.begin(),y=upper_bound(v.begin(),v.end(),r)-v.begin()-1;
            if (x<=y)
                ch=1;
        }
        if (ch){
            kq=mid;
            hi=mid-1;
        }
        else
            lo=mid+1;
    }
    return kq;
}

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