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 "horses.h"
#include <iostream>
#include <set>
#include <climits>
using namespace std;
const int nmax=500005;
set<int> s;
set<int>::iterator it;
const long long mod=1000*1000*1000+7;
long long pr[4*nmax];
int arb[4*nmax];
int bun[nmax],v[nmax];
int mx,x,y,value,poz,st,dr,n,lg,ok,lst,M;
long long ans;
void U(int nod,int l,int r)
{
if(l==r)
{
pr[nod]=value;
return;
}
int m=(l+r)/2;
if(poz<=m) U(2*nod,l,m);
else U(2*nod+1,m+1,r);
pr[nod]=(1LL*pr[2*nod]*pr[2*nod+1])%mod;
}
void Q(int nod,int l,int r)
{
if(st<=l&&r<=dr)
{
ans=(1LL*ans*pr[nod])%mod;
return;
}
int m=(l+r)/2;
if(st<=m) Q(2*nod,l,m);
if(m<dr) Q(2*nod+1,m+1,r);
}
void update(int nod,int l,int r)
{
if(l==r)
{
arb[nod]=value;
return;
}
int m=(l+r)/2;
if(poz<=m) update(2*nod,l,m);
else update(2*nod+1,m+1,r);
arb[nod]=max(arb[2*nod],arb[2*nod+1]);
}
void query(int nod,int l,int r)
{
if(st<=l&&r<=dr)
{
M=max(M,arb[nod]);
return;
}
int m=(l+r)/2;
if(st<=m) query(2*nod,l,m);
if(m<dr) query(2*nod+1,m+1,r);
}
int qry(int S,int D)
{
st=S;dr=D;M=0;
query(1,1,n);
return M;
}
int get_mx()
{
long long opt=0;
it=s.lower_bound(n+1);
lg=32;mx=0;ok=1;poz=n;lst=n+1;
for(int i=1;i<=lg&&it!=s.begin()&&ok;i++)
{
it--;
x=v[(*it)-1];y=qry((*it),lst-1);
if(y>mx) mx=y,poz=(*it),opt=y;
if(mx!=0&&x>INT_MAX/mx) ok=0;
else mx*=x;
lst=(*it);
}
st=1;dr=poz;ans=1;
Q(1,1,n);
ans=(1LL*ans*opt)%mod;
return ans;
}
int init(int N, int X[], int Y[]) {
n=N;
for(int i=0;i<N;i++)
{
poz=i+1;value=X[i];v[i]=X[i];
U(1,1,n);
}
for(int i=0;i<N;i++)
{
poz=i+1;value=Y[i];
update(1,1,n);
}
s.insert(n+1);lst=N;
for(int i=N-1;i>=0;i--)
if(X[i]!=1)
{
s.insert(i+1);
bun[i+1]=qry(i+1,lst);
lst=i;
}
if(s.find(1)==s.end())
{
bun[1]=qry(1,n);
s.insert(1);
}
return get_mx();
}
int updateX(int pos, int val) {
poz=pos+1;value=val;
if(v[poz-1]!=1)
{
s.erase(poz);
}
U(1,1,n);
v[poz-1]=val;
if(val!=1)
{
s.insert(poz);
}
bun[poz]=qry(poz,(*s.upper_bound(poz))-1);
if(s.find(1)==s.end())
{
bun[1]=qry(1,n);
s.insert(1);
}
return get_mx();
}
int updateY(int pos, int val) {
poz=pos+1;value=val;
update(1,1,n);
it=s.upper_bound(poz);
if(it!=s.begin())
{
it--;
bun[(*it)]=qry((*it),(*s.upper_bound((*it)))-1);
}
bun[1]=qry(1,n);
return get_mx();
}
Compilation message (stderr)
horses.cpp: In function 'int get_mx()':
horses.cpp:84:12: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
return ans;
^~~
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