Pre-processor derivative: # include<bits/stdc++.h>
, #include<iostream>
standard library usage: using namespace std;
important data types:
vector\<int\> v;
map<int, int> order;
Operations on vector: v.push_back(x);
, v.pop_back();
output all the vector elements: for(int i = 0; i < v.size(); i++) cout<<v[i]<<"\n";
sort: sort(v.begin(), v.end());