What are some of the useful c++ commands or hacks helpful in competitive programming?
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You may refer to this quora question here:
Competitive Programming: What are some cool C++ tricks to use in a programming contest?
This CF blog post is probably also worth a read: Effective Usage of C++ STL for quick and concise code writing in competitive programming
#include <bits/stdc++.h>is a beauty(basically, it includes everything you will ever need in a contest). Another "hack" that I like a lot is casting an integer to a bitset and then couting that bitset, it helps a lot in debugging bitmaasks ant the like. Other than that, practice, practice and more practice!Can u provide an example to illustrate the second part of your answer(casting an integer,debugging bitmasks)?Since i'm a beginner,i'm not able to understand that.
Like this. Debugging is just a use of it, sometimes you do a lot of bit-fiddling in an algo and you want to track down an error, but it may also help to cout the binary representation of a number if a problem asks for it, etc...
Include it, and add at least 1 second to your compiler time :(
http://codeforces.net/blog/entry/15643