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>
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
#define rep(i,n) for(int i=0;i<n;i++)
#define crep(i,x,n) for(int i=x;i<n;i++)
#define drep(i,n) for(int i=n-1;i>=0;i--)
#define vec(...) vector<__VA_ARGS__>
#define _3cSpNGp ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
using namespace std;
typedef long long ll;
typedef long double ld;
using pii=pair<int,int>;
using vi=vector<int>;
struct node{
int val=0;
node *l,*r;
node(int _val) : val(_val),l(nullptr),r(nullptr){}
node(node *_l,node *_r) : val(0),l(_l),r(_r){
if(l) val+=l->val;
if(r) val+=r->val;
}
};
node* roots[200006];
node* build(int l,int r){
if(l==r-1)
return new node(0);
int m=(l+r)>>1;
return new node(build(l,m),build(m,r));
}
node* update(node* v,int l,int r,int pos,int val){
if(l==r-1){
return new node(val);
}
int m=(l+r)>>1;
if(pos<m)
return new node(update(v->l,l,m,pos,val),v->r);
return new node(v->l,update(v->r,m,r,pos,val));
}
int prod(node* v,int l,int r,int _l,int _r){
if(l>=_r or r<=_l)
// _e
return 0;
if(_l<=l and r<=_r)
return v->val;
int m=(l+r)>>1;
return prod(v->l,l,m,_l,_r)+prod(v->r,m,r,_l,_r);
}
int get(node* v,int l,int r,int pos){
// cout<<pos<<"\n";
if(l==r-1)
return v->val;
int m=(l+r)>>1;
if(pos<m)
return get(v->l,l,m,pos);
return get(v->r,m,r,pos);
}
int main(){
_3cSpNGp;
int n,q;
cin>>n>>q;
vi a(n);
rep(i,n) cin>>a[i];
rep(i,n) a[i]=min(a[i],n);
vec(vi) rbts(n+1);
rep(i,n){
rbts[a[i]].pb(i);
}
roots[n+1]=build(0,n);
drep(i,n+1){
if(!i) break;
roots[i]=roots[i+1];
for(auto j : rbts[i]){
roots[i]=update(roots[i],0,n,j,1);
}
}
auto bs=[&](int l,int r)->int{
int _l=1,_r=n,_c=0;
while(_l<=_r){
int _m=(_l+_r)>>1;
if(prod(roots[_m],0,n,l,r)>=_m){
_c=_m;
_l=_m+1;
}else{
_r=_m-1;
}
}
return _c;
};
rep(_,q){
int l,r;
cin>>l>>r;
cout<<bs(l-1,r)<<"\n";
}
//
return 0;
}
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |