This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define p(x,y) pair<ll,ll>(x,y)
#define BIT(i,x) ((x>>i)&1)
#define MASK(x) (1<<x)
#define ld long double
#define __builtin_popcount __builtin_popcountll
#define pll pair<ll,ll>
template<class T1,class T2>
bool maximize(T1 &x,const T2 &y)
{
if(x<y)
{
x=y;
return 1;
}
return 0;
}
template<class T1,class T2>
bool minimize(T1 &x,const T2 &y)
{
if(x>y)
{
x=y;
return 1;
}
return 0;
}
void online()
{
std::ios_base::sync_with_stdio(0);
cin.tie(0);
#ifndef ONLINE_JUDGE
// freopen("input.inp", "r", stdin);
// freopen("output.out","w", stdout);
#else
#endif
}
static const ll N=1e6+10,M=1e16;
ll n,m,A,B,a[N][21],b[N],f[N],po[21];
ll rmq(ll l,ll r)
{
ll z=log2(r-l);
return max(a[l][z],a[r-po[z]+1][z]);
}
ll c(ll l,ll r)
{
return rmq(l,r)*(n-l+1);
}
int main()
{
online();
cin>>n;
for(ll i=1;i<=n;i++)
{
cin>>a[i][0];
}
po[0]=1;
for(int k=1;k<=19;k++) po[k]=po[k-1]*2;
for(int j=1;j<=19;j++)
for(int i=1;i+po[j]-1<=n;i++)
{
a[i][j]=max(a[i][j-1],a[i+po[j-1]][j-1]);
}
f[0]=0;
deque<pll> vt;
vt.emplace_back(0,0);
ll ans=M;
for(ll i=1;i<=n;i++)
{
while(vt.size()>=2&&vt[1].fi<=i) vt.pop_front();
ll k=vt[0].se;
f[i]=f[k]+c(k+1,i);
for(ll j=vt.size()-1;j>=0;j--)
{
if(f[vt[j].se]+c(vt[j].se+1,vt[j].fi)>f[i]+c(i+1,vt[j].fi))
{
vt.pop_back();
}
else
{
ll b=vt[j].fi,d=n/2+1;
while(d)
{
while(b+d<=n&&f[vt[j].se]+c(vt[j].se+1,b+d)<=f[i]+c(i+1,b+d)) b+=d;
d/=2;
}
b++;
if(b!=n+1)
{
vt.emplace_back(b,i);
}
break;
}
}
if(vt.empty()) vt.emplace_back(1,i);
for(auto v:vt) cout<<"("<<v.fi<<","<<v.se<<") ";
cout<<f[i];
cout<<'\n';
}
cout<<f[n];
}
Compilation message (stderr)
Discharging.cpp: In function 'int main()':
Discharging.cpp:71:8: warning: unused variable 'ans' [-Wunused-variable]
71 | ll ans=M;
| ^~~
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