#if defined(_USE_MATH_DEFINES) && !defined(_MATH_DEFINES_DEFINED)
#define _MATH_DEFINES_DEFINED

/* Define _USE_MATH_DEFINES before including math.h to expose these macro
 * definitions for common math constants.  These are placed under an #ifdef
 * since these commonly-defined names are not part of the C/C++ standards.
 */

/* Definitions of useful mathematical constants
 * M_E        - e
 * M_LOG2E    - log2(e)
 * M_LOG10E   - log10(e)
 * M_LN2      - ln(2)
 * M_LN10     - ln(10)
 * M_PI       - pi
 * M_PI_2     - pi/2
 * M_PI_4     - pi/4
 * M_1_PI     - 1/pi
 * M_2_PI     - 2/pi
 * M_2_SQRTPI - 2/sqrt(pi)
 * M_SQRT2    - sqrt(2)
 * M_SQRT1_2  - 1/sqrt(2)
 */

#define M_E        2.71828182845904523536
#define M_LOG2E    1.44269504088896340736
#define M_LOG10E   0.434294481903251827651
#define M_LN2      0.693147180559945309417
#define M_LN10     2.30258509299404568402
#define M_PI       3.14159265358979323846
#define M_PI_2     1.57079632679489661923
#define M_PI_4     0.785398163397448309616
#define M_1_PI     0.318309886183790671538
#define M_2_PI     0.636619772367581343076
#define M_2_SQRTPI 1.12837916709551257390
#define M_SQRT2    1.41421356237309504880
#define M_SQRT1_2  0.707106781186547524401

#endif  /* _USE_MATH_DEFINES */

I found this on the internet archive :D

Link

that's happening when there is a reply of reply of reply ...etc
this is bad

Hello Codeforces

I think The programmers now watching the Clasico ,
So, Who do you support? Real Madrid or Barcelona ?

For Fun :)

Hello World :)

For non Russian — English speaker.

I think understanding a problem will help you to solve it faster , also the solution is all about understanding the problem. So tell me what you do to understand the problem statement. Thanks :)

We all know stdc++.h lib that includes all libs in c++ But we can't use it in visual studio so i know a way to use it in visual studio , and this may help any one using VS and want to use stdc++.h

First thing

Download stdc++.h lib this is a link to download the file

Download link

Second thing

Copy the stdc++.h file Go to DIR C:\Program Files\Microsoft Visual Studio 12.0\VC\include\ Create new folder here and name it bits then paste stdc++.h inside the folder

Last thing

Open VS , make c++ project and try the Lib #include<bits/stdc++.h>

and that is everything I hope that will help you :)

Hello Everyone.

When i started with problem solving i still don't know how to make a good plan to train well, Even i don't have any good reference to learn from. I am just solving problems, i think it's bad thing , 'coz everything goes slower. My main problem is in graph, it is easy but i can't solve any graph topics and some of DP topics.

Please help me to train well 'coz there is contest (ACM JCPC) in first of october 2016, i have only one month to train.

Thank you.

Hello every body.

please tell me how to add some one as friend on codeforces.

there is no add friend button in any profile but i see i have 6 friend ,i don't know how they added me.

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