#include <bits/stdc++.h>
using namespace std;
typedef long long llo;
#define mp make_pair
#define pb push_back
#define a first
#define b second
//#define endl '\n'
int n;
int it[1000001];
int tree[1000001*4];
pair<int,int> pp[1000001];
int ans[1000001];
int re[1000001];
//int mi[1000001][20];
void build(int no,int l,int r){
if(l==r){
tree[no]=it[l];
}
else{
int mid=(l+r)/2;
build(no*2+1,l,mid);
build(no*2+2,mid+1,r);
tree[no]=max(tree[no*2+1],tree[no*2+2]);
}
}
int query(int no,int l,int r,int aa,int bb){
if(r<aa){
return -1;
}
if(aa<=l){
if(tree[no]<=bb){
return -1;
}
if(l==r){
return l;
}
}
int mid=(l+r)/2;
int x=query(no*2+1,l,mid,aa,bb);
if(x==-1){
return query(no*2+2,mid+1,r,aa,bb);
}
else{
return x;
}
}
vector<int> pre[1000001];
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin>>n;
/*for(int i=0;i<n;i++){
for(int j=0;j<20;j++){
mi[i][j]=1;
}
}*/
for(int i=0;i<n;i++){
cin>>it[i];
}
vector<pair<int,int>> ss;
vector<pair<pair<int,int>,int>> tt;
set<int> kk;
build(0,0,n-1);
int cur=0;
for(int i=0;i<n;i++){
while(ss.size()){
if(ss.back().a<=it[i]){
ss.pop_back();
}
else{
break;
}
}
pp[i]={-1,-1};
if(ss.size()){
int ne=ss.back().b;
tt.pb({{ne,i-1},cur});
//cur++;
int jj=*kk.upper_bound(it[i]);
pp[i]={ss.back().b,jj};
/*
int low=query(0,0,n-1,i,jj);
if(low!=-1){
tt.pb({{i,low-1},cur});
//cur++;
}*/
}
kk.insert(it[i]);
ss.pb({it[i],i});
}
vector<pair<int,int>> cc;
for(int i=n-1;i>=0;i--){
while(cc.size()){
if(cc.back().a<it[i]){
cc.pop_back();
}
else{
break;
}
}
re[i]=-1;
/* if(cc.size()){
re[i]=cc.back().b;
if(pp[i].a!=-1){
int cur2=cc.back().b;
while(cur2!=-1){
if(it[cur2]>pp[i].b){
// cout<<i<<":"<<cur2<<endl;
tt.pb({{i,cur2-1},cur});
break;
}
cur2=re[cur2];
}
}*/
/*if(pp[i].a!=-1){
if(cc[0].a>pp[i].b){
if(cc.back().a<=pp[i].b){
ans[i]=ans[cc.back().b];
}
else{
ans[i]=cc.back().b;
}
tt.pb({{i,ans[i]-1},cur});
}
}*/
//}
cc.pb({it[i],i});
}
for(int i=0;i<n;i++){
if(pp[i].a!=-1){
if(re[pp[i].a]!=-1){
int cur2=re[pp[i].a];
tt.pb({{i,cur2-1},cur});
}
}
}
for(auto j:tt){
pre[j.a.b].pb(j.a.a);
}
int ans=1;
int ma=-1;
for(int i=0;i<n-1;i++){
for(auto j:pre[i]){
if(j<=ma){
continue;
}
ans+=1;
ma=i;
}
}
cout<<ans<<endl;
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
17 ms |
23916 KB |
Output is correct |
| 2 |
Incorrect |
16 ms |
23788 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
17 ms |
23916 KB |
Output is correct |
| 2 |
Incorrect |
16 ms |
23788 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
17 ms |
23916 KB |
Output is correct |
| 2 |
Incorrect |
16 ms |
23788 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
17 ms |
23916 KB |
Output is correct |
| 2 |
Incorrect |
16 ms |
23788 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
