#include<bits/stdc++.h>
//#define int long long
#define ll long long
#define fd(i,a,b) for(register int i=a;i<=b;i=-~i)
#define bd(i,a,b) for(register int i=a;i>=b;i=~-i)
using namespace std;
const int N=1e5+509,M=509,MOD=10007;
int n,siz,id;
int bel[N],a[N];
int sum[M],add[M],L[M],R[M],cnt[70005],val[N],f[M][M];
unordered_map<int,int> mp;
vector<int> ve[N];
inline int read()
{
int num=0; bool flag=1; char c=getchar();
while(!isdigit(c)){if(c=='-') flag=0;c=getchar();}
while(isdigit(c)){num=(num<<1)+(num<<3)+(c-'0');c=getchar();}
return flag?num:-num;
}
inline void write(int x)
{
if(x<0) putchar('-'),x=-x;
if(x>9) write(x/10);
putchar((x%10)^48);
}
namespace FJ
{
void build(int len)
{
siz=sqrt(len);
fd(i,1,siz)
{
L[i]=(i-1)*siz+1;
R[i]=i*siz;
}
if(R[siz]<len)
{
++siz;
L[siz]=R[siz-1]+1;
R[siz]=n;
}
fd(i,1,siz)
{
fd(j,L[i],R[i])
{
bel[j]=i;
}
}
fd(i,1,siz)
{
memset(cnt,0,sizeof(cnt));
int mx=0,ans=0;
fd(j,L[i],n)
{
cnt[a[j]]=-~cnt[a[j]];
if(cnt[a[j]]>mx||((cnt[a[j]]==mx&&val[a[j]]<val[ans])))
ans=a[j],mx=cnt[a[j]];
f[i][bel[j]]=ans;
}
}
}
int query(int l,int r,int x)
{
int t=upper_bound(ve[x].begin(),ve[x].end(),r)-lower_bound(ve[x].begin(),ve[x].end(),l);
return t;
}
int ask(int l,int r)
{
int p=bel[l],q=bel[r];
int res=0,mx=0;
res=f[bel[l]+1][bel[r]-1];
mx=query(l,r,res);
if(p==q)
{
fd(i,l,r)
{
int t=query(l,r,a[i]);
if(t>mx||(t==mx&&val[a[i]]<val[res])) res=a[i],mx=t;
}
return res;
}
fd(i,l,R[p])
{
int t=query(l,r,a[i]);
if(t>mx||(t==mx&&val[a[i]]<val[res])) res=a[i],mx=t;
}
fd(i,L[q],r)
{
int t=query(l,r,a[i]);
if(t>mx||((t==mx&&val[a[i]]<val[res]))) res=a[i],mx=t;
}
return res;
}
}
signed main()
{
// freopen("A.in","r",stdin);
// freopen("A.out","w",stdout);
// #ifdef FJ
// ios::sync_with_stdio(0);
// cin.tie(0); cout.tie(0);
// #endif
n=read();
fd(i,1,n)
{
a[i]=read();
if(!mp[a[i]])
{
mp[a[i]]=++id;
val[id]=a[i];
}
a[i]=mp[a[i]];
ve[a[i]].push_back(i);
}
FJ::build(n);
fd(i,1,n)
{
int opt,a,b,c;
a=read();b=read();//c=read();
write(val[FJ::ask(a,b)]),puts("");
}
return 0;
}
标签:val,分块,int,模版,中位数,long,&&,siz,mx
From: https://www.cnblogs.com/whrwlx/p/18170953