Submission #129984

#	Time	Username	Problem	Language	Result	Execution time	Memory
129984		Vardanyan	Hacker (BOI15_hac)	C++14	40 / 100	1070 ms	1656 KiB

hac

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

const int N = 500*1000+5;
int a[N];
long long pref[N];
int main(){
    ios_base::sync_with_stdio(false);
    int n;
    cin>>n;
    long long all = 0;
    for(int i = 1;i<=n;i++) {
        cin>>a[i];
        all+=a[i];
        pref[i] = pref[i-1]+a[i];
    }
    long long ans = 0;
    for(int i = 1;i<=n;i++){
        long long mx = 0;
        for(int j = 1;j<=n;j++){
            int jj = j;
            int qn = 0;
            long long cur = 0;
            /*while(1){
                if(jj == i) break;
                cur+=a[jj];
                qn++;
                if(qn == n/2) break;
                jj++;
                if(jj>n) jj = 1;
            }*/
            int l = j;
            int r = j+n/2-1;
            if(r>n) r = (r-n);
            if(r>=l){
                if(i<l || i>r){
                    cur = pref[r]-pref[l-1];
                }
            }
            else{
                if(i>r && i<l){
                    cur+=(pref[r]);
                    cur+=(pref[n]-pref[l-1]);
                }
            }
            mx = max(mx,cur);
        }
        ans = max(ans,all-mx);
    }
    cout<<ans<<endl;

    return 0;
}

Compilation message (stderr)

hac.cpp: In function 'int main()':
hac.cpp:21:17: warning: unused variable 'jj' [-Wunused-variable]
             int jj = j;
                 ^~
hac.cpp:22:17: warning: unused variable 'qn' [-Wunused-variable]
             int qn = 0;
                 ^~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 40