link to the problem: https://cses.fi/problemset/task/1091/

my first blog post... please excuse me for my way of writing blog

My solution: I) approach: use multiset for the ticket price, and vector for customers bidding, I switched input to -ve sign in set, so I can make the implementation easier...

code:

~~~~~
#include <bits/stdc++.h>

using namespace std;

int main(){
long long int tic,cus,h;
multiset<int> price;
cin >>tic >>cus;
for(int i=0;i<tic;i++){
    cin >>h;
    h = -h;
    price.insert(h);
}
vector <int> customer;
for(int i=0;i<cus;i++){
    cin >>customer[i];
}
for(int k=0;k<cus;k++){
        auto it=price.begin();
        for(;it!=price.end();it++){
        h = 0;
    if(abs(*it) <= customer[k]){
        h = *it;
        it--;
        cout <<-h <<endl;
        price.erase(price.find(h));
        break;
    }
}

if(it == price.end() && h ==0)
    cout <<-1 <<endl;
}

}

~~~~~

problem: code shows no output, and returns -10221910 etc... i couldn't find the reason for undefined behaviour.