C++ || STL || standard template libraries
C++ STL 1. Pair : Syntax : pair <int,char> p1; it creates a pair {2,'c'} like this. pair <int,int> p2; it creates a pair {2,3} like this . Basic Code : #include <bits/stdc++.h> using namespace std; int main() { // cout<<"hello world\n"; pair <int,int> p1 = {1,2}; cout<<p1.first<< " "<< p1.second<<endl; pair <int, pair<int ,char>> p2 = {1,{2,'c'}}; cout<<p2.first<<" "<<p2.second.first<<" "<<p2.second.second<<endl; pair <int,int> arr[] = {{2,3},{4,5},{6,7}}; cout...