Submission #905390

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define all(c) (c).begin(),(c).end()
#define rrep(i,n) for(int i=(int)(n)-1;i>=0;i--)
#define REP(i,m,n) for(int i=(int)(m);i<(int)(n);i++)
#define rep(i,n) REP(i,0,n)
#define iter(c) __typeof((c).begin())
#define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++)
#define mem(a) memset(a,0,sizeof(a))
#define pd(a) printf("%.10f\n",a)
#define pb(a) push_back(a)
#define in(a) insert(a)
#define pi M_PI
#define R cin>>
#define F first
#define S second
#define C class
#define ll long long
#define ln cout<<'\n'
template<C T>void pr(T a){cout<<a;ln;}
template<C T,C T2>void pr(T a,T2 b){cout<<a<<' '<<b;ln;}
template<C T,C T2,C T3>void pr(T a,T2 b,T3 c){cout<<a<<' '<<b<<' '<<c;ln;}
template<C T>void PR(T a,int n){rep(i,n){if(i)cout<<' ';cout<<a[i];}ln;}
bool check(int n,int m,int x,int y){return x>=0&&x<n&&y>=0&&y<m;}
const ll MAX=1000000007,MAXL=1LL<<60,dx[4]={-1,0,1,0},dy[4]={0,1,0,-1};
typedef pair<int,int> P;
class RMQ{
public:
  int n,dat[555555];
  void init(int _n){
    n=1;
    while(n<_n)n*=2;
    fill(dat,dat+2*n-1,MAX);
  }
  void update(int k,int a){
    k+=n-1;dat[k]=a;
    while(k>0){
      k=(k-1)/2;
      dat[k]=min(dat[k*2+1],dat[k*2+2]);
    }
  }
  int query(int a,int b){return query(a,b,0,0,n);}
  int query(int a,int b,int k,int l,int r){
    if(r<=a||b<=l) return MAX;
    if(a<=l&&r<=b) return dat[k];
    int vl=query(a,b,k*2+1,l,(l+r)/2);
    int vr=query(a,b,k*2+2,(l+r)/2,r);
    return min(vl,vr);
  }
};

void Main() {
  ll n;
  R n;
  ll a[n];
  RMQ t;
  t.init(n+1);
  rep(i,n) {
    R a[i];
    t.update(i+1,a[i]);
  }
  ll ans=0;
  rep(i,n) {
    ll l=0,r=i+1;
    while(l+1<r) {
      int m=(l+r)/2;
      if(t.query(m,i+2)<a[i]) l=m;
      else r=m;
    }
    ll x=i-l+1;
    l=i,r=n;
    while(l+1<r) {
      int m=(l+r)/2;
      if(t.query(i+1,m+2)<a[i]) r=m;
      else l=m;
    }
    ll y=l-i+1;
    ans+=x*y*a[i];
  }
  pr(ans);
}

int main() {
  ios::sync_with_stdio(0);cin.tie(0);
  Main();return 0;
}

Submission Info

Judge Result