Submission #310194

#	Time	Username	Problem	Language	Result	Execution time	Memory
310194		nicolaalexandra	Hacker (BOI15_hac)	C++14	100 / 100	262 ms	11812 KiB

hac

#include <bits/stdc++.h>
#define DIM 1000010
using namespace std;

int v[DIM],sp[DIM];
deque <pair<int,int> > d;
int n,i;

int main (){

    //ifstream cin ("date.in");
    //ofstream cout ("date.out");

    cin>>n;
    for (i=1;i<=n;i++)
        cin>>v[i];

    int lg = (n+1) / 2;

    for (i=n+1;i<=2*n;i++)
        v[i] = v[i-n];

    for (i=1;i<=2*n;i++)
        sp[i] = sp[i-1] + v[i];

    for (i=lg;i<2*lg;i++){
        while (!d.empty() && sp[i] - sp[i-lg] <= d.back().first)
            d.pop_back();
        d.push_back(make_pair(sp[i] - sp[i-lg],i));
    }

    int sol = d.front().first;

    for (i=2*lg;i<=2*n;i++){
        while (!d.empty() && sp[i] - sp[i-lg] <= d.back().first)
            d.pop_back();
        d.push_back(make_pair(sp[i] - sp[i-lg],i));

        while (d.front().second <= i-lg)
            d.pop_front();

        sol = max (sol,d.front().first);
    }

    cout<<sol;

    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 40 / 40