std used

Question 1

What is unordered_map<type key,type value>

Answer 1

Unordered map is an associative container that contains key-value pairs with unique keys. Search, insertion, and removal of elements have average constant-time complexity.

Question 2

How to find an element in an unordered_map

Answer 2

unordered_map<int,int> mp;
mp.find(key) != mp.end()

Question 3

How to iterate over characters in a string

Answer 3

for (char c : theString) { }

Question 4

How to initialize a vector of int and size n to x

Answer 4

vector<int> v(n, x);</int>

Question 5

iterator over items in vector automatically w/o index

Answer 5

vector<int> nums;
for(int i : nums ) { }</int>

Question 6

How to use sort in c++

Answer 6

include <algorithms></algorithms>

(void)sort(vec.begin(),vec.end());