mynotes.txt

## C++ Section
- to push a character at back str.push_back('c')
- to append at specific index str.append(index,char)
- .length() to find length of string
- access char at specific index str.at(4)
- s[i]!='\0' can be a helpful terminating condition sometimes ;)
- empty char '\0'
- max=INT_MIN	min=INT_MAX
- sort(a,a+n)
- sort(fraction.begin(),fraction.end(),greater<int>()) // sort vector
- cout<<fixed<<setprecision(n)<<; // to give output to n places after decimal.
- abs(x) gives absolute value of x
- to initialize array to 0; int a[x] = {0};//works for double dimentional array as well.
- map<int, int> map1; map<int, int>::iterator itr;
- max_element(v.begin(),v.end()) - v.begin();	//index of max element
- *max_element(v.begin(), v.end());		//value of max element

cses.fi/problemset

Type					Typical Bit Width	Typical Range
char					1byte				-127 to 127 or 0 to 255
unsigned char			1byte				0 to 255
signed char				1byte				-127 to 127
int						4bytes				-2147483648 to 2147483647
unsigned int			4bytes				0 to 4294967295
signed int				4bytes				-2147483648 to 2147483647
short int				2bytes				-32768 to 32767
unsigned short int		2bytes				0 to 65,535
signed short int		2bytes				-32768 to 32767
long int				8bytes				-2,147,483,648 to 2,147,483,647
signed long int			8bytes				same as long int
unsigned long int		8bytes				0 to 18,446,744,073,709,551,615
long long int			8bytes				-(2^63) to (2^63)-1
unsigned long long int	8bytes				0 to 18,446,744,073,709,551,615
float					4bytes	
double					8bytes	
long double				12bytes	
wchar_t					2 or 4 bytes		1 wide character

# Scrape code maybe::

#include<bits/stdc++.h>
using namespace std;

#define abhinav ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
#define endl "\n"
#define ll long long int

void solve(){}

int main()
{
	abhinav;
	int t;
	cin>>t;
	while(t--)
	{
		solve();
	}
	return 0;
}



count number of bits::
ll bitcount(ll n){
    ll count = 0;
    while (n > 0){
        count += 1;
        n = n & (n-1);
    }
    return count;
}

--Binary representation

for i in 30..0
	if(x & (1<<i)!=0)
		cout<<1;
	else
		cout<<0;


--GCD of two numbers

if(b==0)
    return a;
  else if(a>b)
    return gcd_fast(b,a%b);
  else
    return gcd_fast(a,b%a);