Submission #103038

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
103038	2019-03-28 19:58:51	pavel	Hacker (BOI15_hac)	C++14	100 / 100	687 ms	18468 KiB

hac

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#include <cstdio>
#include <algorithm>
#include <set>
using namespace std;
const int MAXN = 500005;
int n,k;
int a[MAXN];
int sum[MAXN];
int main(){
    scanf("%d", &n);
    k=(n+1)/2;
    for(int i=0;i<n;++i) scanf("%d", &a[i]);
    for(int i=0;i<k;++i) sum[0]+=a[i];
    for(int i=1;i<n;++i){
        sum[i]=sum[i-1]-a[i-1]+a[(i+k-1+n)%n];
    }
    multiset<int> s;
    for(int i=0;i<k;++i) s.insert(sum[i]);
    int sol=*s.begin();
    int t = n;
    for(int i=k;t;t--,i=(i+1)%n){
        s.insert(sum[i]);
        s.erase(s.lower_bound(sum[(i-k+n)%n]));
        sol=max(sol, *s.begin());
    }
    printf("%d", sol);
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

hac.cpp: In function 'int main()':
hac.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
hac.cpp:16:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i=0;i<n;++i) scanf("%d", &a[i]);
                          ~~~~~^~~~~~~~~~~~~

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