| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 180286 |
2020-01-08T15:27:47 Z |
MvC |
Hacker (BOI15_hac) |
C++11 |
|
0 ms |
0 KB |
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define mkp make_pair
#define in insert
#define er erase
#define fd find
#define fr first
#define sc second
typedef long long ll;
typedef long double ld;
const ll INF=0x3f3f3f3f3f3f3f3f;
const ll llinf=(1LL<<62);
const int inf=(1<<30);
const int nmax=5e5+50;
const int mod=1e9+7;
using namespace std;
int n,i,st[4*nmax],a[nmax],cur,tot,rs,j;
int tr(int x)
{
x+=n;
x%=n;
if(!x)x=n;
return x;
}
void upd(int x,int l,int r,int p,int v)
{
if(l==r)
{
st[x]=v;
return;
}
int mid=(l+r)/2;
if(p<=mid)upd(2*x,l,mid,p,v);
else upd(2*x+1,mid+1,r,p,v);
st[x]=max(st[2*x],st[2*x+1]);
}
int qry(int x,int l,int r,int tl,int tr)
{
if(tl>tr || tl>n || tr>n || tl<1 || tr<1)return 0;
if(l>tr || tl>r)return 0;
if(tl<=l && r<=tr)return st[x];
int mid=(l+r)/2;
return max(qry(2*x,l,mid,tl,tr),qry(2*x+1,mid+1,r,tl,tr));
}
int main()
{
//freopen("sol.in","r",stdin);
//freopen("sol.out","w",stdout);
//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
cin>>n;
for(i=1;i<=n;i++)cin>>a[i],tot+=a[i];
for(i=1;i<=n/2;i++)cur+=a[i];
for(j=1;j<=n;j++,i++)
{
i=tr(i);
upd(1,1,n,j,cur);
cur-=a[tr(i-n/2)];
cur+=a[tr(i)];
}
for(i=1;i<=n;i++)
{
//cout<<i<<" "<<1<<" "<<i-n/2<<" "<<i+1<<" "<<tr(i-n/2)<<endl;
cur=qry(1,1,n,1,i-n/2);
if(i+1<=tr(i-n/2))cur=max(cur,qry(1,1,n,i+1,tr(i-n/2)))l
else if(i+1>tr(i-n/2))cur=max(cur,max(qry(1,1,n,i+1,n),qry(1,1,n,1,tr(i-n/2))));
rs=max(rs,tot-cur);
}
cout<<rs<<endl;
return 0;
}
Compilation message
hac.cpp: In function 'int main()':
hac.cpp:69:58: error: expected ';' before 'l'
if(i+1<=tr(i-n/2))cur=max(cur,qry(1,1,n,i+1,tr(i-n/2)))l
^
