Submission #954722

#	Time	Username	Problem	Language	Result	Execution time	Memory
954722		PieArmy	Hacker (BOI15_hac)	C++17	0 / 100	1 ms	348 KiB

hac

typedef long long ll;
ll pie(ll army){return (1ll<<army);}
#include <bits/stdc++.h>
#define fr first
#define sc second
#define pb push_back
#define endl '\n'
#define mid ((left+right)>>1)
const ll inf=2000000000000000005;
const int sonsuz=2000000005;
using namespace std;
ll fpow(ll x,ll y,ll m=0){if(y<0){cout<<"powError";return -1;}if(m)x%=m;ll res=1;while(y>0){if(y&1)res*=x;x*=x;if(m){x%=m;res%=m;}y>>=1;}return res;}

void code(){
    int n;cin>>n;
    int arr[n<<1];
    for(int i=0;i<n;i++){
        cin>>arr[i];
        arr[i+n]=arr[i];
    }
    int sms[n<<1];
    int sum=0;
    for(int i=0;i<((n+1)>>1)-1;i++)
        sum+=arr[i];
    for(int i=0;i<n;i++){
        sum+=arr[i+((n+1)>>1)-1];
        sms[i]=sum;
        sum-=arr[i];
    }
    int ans=0;
    multiset<int>st;
    for(int i=0;i<((n+1)>>1)-1;i++)
        st.insert(sms[i]);
    for(int i=0;i<n;i++){
        st.insert(sms[i+((n+1)>>1)-1]);
        ans=max(ans,*st.begin());
        st.erase(st.find(sms[i]));
    }
    cout<<ans;
}

int main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);
    bool usaco=0;if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
    int t=1;
    if(!t)cin>>t;
    while(t--){code();cout<<endl;}
    return 0;
}

Compilation message (stderr)

hac.cpp: In function 'int main()':
hac.cpp:44:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |     bool usaco=0;if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
      |                            ~~~~~~~^~~~~~~~~~~~~~~~~
hac.cpp:44:60: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |     bool usaco=0;if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
      |                                                     ~~~~~~~^~~~~~~~~~~~~~~~~~~

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