Submission #4034592

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Source Code Expand

#include<iostream>
using namespace std;
typedef long long ll;
#define fr(i,n) for(int i=0;i<n;i++)

int main(){
  ll n,a[200010],b[200010],L[200010],R[200010],c=0,j,l,r,k;
  cin>>n;
  fr(i,n){
    cin>>a[i];
    b[a[i]]=i+1;
  }
  fr(i,n+2){
    L[i]=i;
    R[i]=i;
  }
  fr(i,n){
    j=n-i;
    k=b[j];
    l=L[k];
    r=R[k];
    c+=j*(k-l+1)*(r-k+1);
    L[r+1]=l;
    R[l-1]=r;
  }
  cout<<c<<endl;
}

Submission Info

Judge Result