Calci_region_sol

#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
#ifdef  ONLINE_JUDGE
    #define eprintf(...) 42
#else
        #define eprintf(...) {fprintf(stderr, __VA_ARGS__);fflush(stderr);}
#endif
clock_t startTime;
double getCurrentTime()
{
    return (double)(clock() - startTime) / CLOCKS_PER_SEC;
}
class tracker_inter
{
    public:
        set<pair<int, int>> forbidden;
        int pt_add(int stuff)
        {
            pair<int, int> previn = {stuff, stuff};
            if(!forbidden.empty() && forbidden.upper_bound({stuff, 2e9})!=forbidden.begin())
            {
                previn = *prev(forbidden.upper_bound({stuff, 2e9}));
            }
            if(previn.second==stuff-1)
            {
                forbidden.erase(previn);
                previn.second++;
            }
            else
            {
                previn = {stuff, stuff};
            }
            forbidden.insert(previn);
            if(next(forbidden.find(previn))!=forbidden.end())
            {
                auto thing = *next(forbidden.find(previn));
                if(thing.first==previn.second+1)
                {
                    forbidden.erase(thing); forbidden.erase(previn);
                    previn.second = thing.second;
                    forbidden.insert(previn);
                }
            }
            return 1;
        }
};
long long solve(vector<int> heights)
{
    tracker_inter Rail;
    int n = heights.size();
    long long ans = 0;
    map<int, vector<int>> posi;
    for(int i=0; i<n; i++)
    {
        posi[heights[i]].push_back(i);
    }
    for(auto lin : posi)
    {
        for(auto stuff : lin.second)
        {
            Rail.pt_add(stuff);
        }
        for(auto stuff : lin.second)
        {
            auto thing = *prev(Rail.forbidden.upper_bound(make_pair(stuff, 2e5)));
            ans += thing.second - thing.first + 1;
        }
    }
    return ans;
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int t=1;
    //cin>>t;
    startTime = clock();
    while(t--)
    {
        startTime = clock();
        int n;
        cin>>n;
        vector<int> heights(n);
        for(int i=0; i<n; i++)
        {
            cin>>heights[i];
        }
        cout<<solve(heights)<<endl;
    }
    eprintf("time = %.5lf\n", getCurrentTime());
    return 0;
}