제출 #329144

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
329144		poom2904	Mountains (NOI20_mountains)	C++11	64 / 100	2082 ms	9316 KiB

Mountains

#include <bits/stdc++.h>
using namespace std;
using ll = long long int;
int n;
vector<ll> height(300001);
vector<int> lower_l(300001,0);
vector<int> lower_r(300001,0);
int main()
{
    ios_base::sync_with_stdio(false);cin.tie(0);
    cin>>n;
    for(int i=1;i<=n;i++)cin>>height[i];
    vector<ll> tem;
    for(int i=2;i<=n;i++)
    {
        tem.insert(upper_bound(tem.begin(),tem.end(),height[i-1]),height[i-1]);
        lower_l[i]=lower_bound(tem.begin(),tem.end(),height[i])-tem.begin();
    }
    tem.clear();
    for(int i=n-1;i>=1;i--)
    {
        tem.insert(upper_bound(tem.begin(),tem.end(),height[i+1]),height[i+1]);
        lower_r[i]=lower_bound(tem.begin(),tem.end(),height[i])-tem.begin();
    }
    ll res=0;
    for(int i=1;i<=n;i++)res+=lower_l[i]*lower_r[i];
    cout<<res;
    return 0;
}

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