Optimal sort

input/code.cpp: In function 'll minimum_operations(std::vector<long long int>&, ll)':
input/code.cpp:17:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     for (auto i = 0; i < arr.size(); i++) {
      |                      ~~^~~~~~~~~~~~
input/code.cpp:40:38: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |                     for (ll i = 0; i < idx.size(); i++) {
      |                                    ~~^~~~~~~~~~~~

#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <queue>
#include <climits>
#include <map>
#include <set>
//#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll minimum_operations(vector<ll>& arr, ll n)
{

    map<ll, vector<ll> > mpp;
    for (auto i = 0; i < arr.size(); i++) {
        mpp[arr[i]].push_back(i);
    }

    queue<ll> q;
    set<ll> st;

    ll count = 0;
    for (ll i = 0; i < n - 1; i++) {
        if (st.find(arr[i]) == st.end() && arr[i] != 0) {
            q.push(arr[i]);
            st.insert(arr[i]);
        }

        if (arr[i] > arr[i + 1]) {

            count += q.size();
            while (!q.empty()) {
                ll top = q.front();
                q.pop();

                if (mpp.find(top) != mpp.end()) {
                    vector<ll> idx = mpp[top];
                    for (ll i = 0; i < idx.size(); i++) {
                        arr[idx[i]] = 0;
                    }
                }
            }
        }
    }

    return count - 2;
}


void task3(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    ll n;
    cin >> n;
    vector<ll> arr(n);
    for(ll i = 0; i < n; i++){
        cin >> arr[i];
    }
    
    cout << minimum_operations(arr, n) << endl;

}

int main() {
    task3();

}

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