#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
int main()
{
int n;
cin>>n;
vector<pair<int,int>> tab(n+1);
tab[0]=make_pair(0,0);
for(int i=1;i<=n;i++)
{
cin>>tab[i].first;
tab[i].second=i;
}
sort(tab.begin(),tab.end());
vector<pair<int,int>> max_intervals(n+1);
max_intervals[n]=make_pair(tab[n].second,tab[n].second);
for(int i=n-1;i>0;i--)
{
int x=tab[i].second;
int p=max_intervals[i+1].first;
int k=max_intervals[i+1].second;
max_intervals[i].first=min(p,x);
max_intervals[i].second=max(k,x);
}
/*for(int i=1;i<=n;i++)
{
cout<<max_intervals[i].first<<" "<<max_intervals[i].second<<endl;
}*/
long long sum=0;
for(int s=1;s<=n;s++)
{
int x=s/2+1;
x=n+1-x;
//cout<<"#"<<s<<" "<<x<<endl;
int p=max_intervals[x].first;
int k=max_intervals[x].second;
//cout<<p<<" "<<k<<endl;
if(k-p+1>s)
{
continue;
}
int p_1=max(1,k-s+1);
int k_1=min(s+p-1,n);
//cout<<p_1<<" "<<k_1<<endl;
int moving=k_1-p_1-s+2;
//cout<<moving<<endl;
sum+=moving;
}
cout<<2*n+1<<" "<<sum<<endl;
return 0;
}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 | #include<iostream> #include<vector> #include<algorithm> using namespace std; int main() { int n; cin>>n; vector<pair<int,int>> tab(n+1); tab[0]=make_pair(0,0); for(int i=1;i<=n;i++) { cin>>tab[i].first; tab[i].second=i; } sort(tab.begin(),tab.end()); vector<pair<int,int>> max_intervals(n+1); max_intervals[n]=make_pair(tab[n].second,tab[n].second); for(int i=n-1;i>0;i--) { int x=tab[i].second; int p=max_intervals[i+1].first; int k=max_intervals[i+1].second; max_intervals[i].first=min(p,x); max_intervals[i].second=max(k,x); } /*for(int i=1;i<=n;i++) { cout<<max_intervals[i].first<<" "<<max_intervals[i].second<<endl; }*/ long long sum=0; for(int s=1;s<=n;s++) { int x=s/2+1; x=n+1-x; //cout<<"#"<<s<<" "<<x<<endl; int p=max_intervals[x].first; int k=max_intervals[x].second; //cout<<p<<" "<<k<<endl; if(k-p+1>s) { continue; } int p_1=max(1,k-s+1); int k_1=min(s+p-1,n); //cout<<p_1<<" "<<k_1<<endl; int moving=k_1-p_1-s+2; //cout<<moving<<endl; sum+=moving; } cout<<2*n+1<<" "<<sum<<endl; return 0; } |
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