#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
int main(){
int n;
cin >> n;
vector<int> numbers(n);
vector<int> position(n+1);
for(int i=0;i<n;i++){
cin >> numbers[i];
position[numbers[i]] = i;
}
int bigger = n, smaller = n;
int _max = position[n], _min = position[n];
long long result = 0;
for(int i=1;i<=n;i++){
_max=max(_max,max(position[bigger], position[smaller]));
_min=min(_min,min(position[bigger], position[smaller]));
if(_max-_min+1<=i){
int start = max(_max-i+1, 0);
int end = min(_min, n-i);
result += (end-start + 1);
}
if(smaller==bigger){
smaller--;
}else{
bigger--;
}
}
cout << 2*n+1 << " " << result << endl;
}
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 | #include<iostream> #include<vector> #include<algorithm> using namespace std; int main(){ int n; cin >> n; vector<int> numbers(n); vector<int> position(n+1); for(int i=0;i<n;i++){ cin >> numbers[i]; position[numbers[i]] = i; } int bigger = n, smaller = n; int _max = position[n], _min = position[n]; long long result = 0; for(int i=1;i<=n;i++){ _max=max(_max,max(position[bigger], position[smaller])); _min=min(_min,min(position[bigger], position[smaller])); if(_max-_min+1<=i){ int start = max(_max-i+1, 0); int end = min(_min, n-i); result += (end-start + 1); } if(smaller==bigger){ smaller--; }else{ bigger--; } } cout << 2*n+1 << " " << result << endl; } |
English