#include <cstdio> #include <algorithm> using namespace std; const int MAXN = 500005; int n; int a[MAXN]; int sum[MAXN]; int main(){ scanf("%d", &n); for(int i=0;i<n;++i) scanf("%d", &a[i]); for(int i=0;i<(n+1)/2;++i) sum[0]+=a[i]; for(int i=1;i<n;++i){ sum[i]=sum[i-1]-a[i-1]+a[((i+(n+1)/2)-1+n)%n]; } int sol=-1; for(int i=0;i<n;++i){ sol=max(sol, min(sum[i], sum[(i+(n+1)/2-1+n)%n])); } printf("%d", sol); }

hac.cpp: In function 'int main()':
hac.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
hac.cpp:14:31: 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]);
                          ~~~~~^~~~~~~~~~~~~