Submission #384660

#	Time	Username	Problem	Language	Result	Execution time	Memory
384660		zoooma13	Hacker (BOI15_hac)	C++14	100 / 100	467 ms	22472 KiB

hac

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

int main()
{
    int n ,sum = 0;
    scanf("%d",&n);
    vector <int> a(n);
    for(int&i : a)
        scanf("%d",&i) ,sum += i;
    a.insert(a.end() ,a.begin() ,a.end());
    vector <int> b(n);
    for(int i=0; i<n/2; i++)
        b[0] += a[i];
    for(int i=1; i<n; i++)
        b[i] = b[i-1] - a[i-1] + a[i+n/2-1];
    b.insert(b.end() ,b.begin() ,b.end());
    multiset <int> ms;
    for(int i=0; i<(n+1)/2; i++)
        ms.insert(b[i]);
    int ans = sum - *ms.rbegin();
    for(int i=0; i<n; i++){
        ms.erase(ms.find(b[i]));
        ms.insert(b[i+(n+1)/2]);
        ans = max(ans ,sum - *ms.rbegin());
    }
    printf("%d\n",ans);
}

Compilation message (stderr)

hac.cpp: In function 'int main()':
hac.cpp:7:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    7 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
hac.cpp:10:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |         scanf("%d",&i) ,sum += i;
      |         ~~~~~^~~~~~~~~

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