salam

here a sample code for Topcoder SRM's

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/* in the name of Allah */
#include <algorithm>
#include <bitset>
#include <cassert>
#include <cctype>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <limits>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <utility>
#include <vector>

using namespace std;

/* Math */
template < class T > inline T GCD(T a , T b){ if(a < 0) return GCD(-a , b) ; if(b < 0) return GCD(a , -b) ; return (b == 0) ? a : GCD(b , a % b) ; }
template < class T > inline T LCM(T a , T b){ if(a < 0) return LCM(-a , b) ; if(b < 0) return LCM(a , -b) ; return a * (b / GCD(a , b)) ; }
template < class T > inline bool isPrime(T n){ if(n < 2) return false ; for(T i = 2 ; i * i <= n ; i++) if(n % i == 0) return false ; return true ; }
template < class T > vector <T> Divisor(T num){ vector <T> res ; res.clear() ; for(int i = 1 ; i <= num/2 ; i++) if(num % i == 0) res.push_back(i) ; return res ; }
template < class T , class M > inline T POWER(T x , M y){/* (x ^ y) compute to 2^63 */ T temp = 1 ; if(y == 0) return 1 ; for(int i = 1 ; i <= y ; i++) temp *= x  ; return temp ;}

/* Manipulation */
template < class T , class M > bool Exist(T x , M element) { for(int i = 0 ; i < x.size() ; i++) if(x[i] == element) return true ; return false ; }
template < class T > vector <T> Unique(vector <T> v){ T temp ; vector <T> res ; res.clear() ; for(int i = 0 ; i  < v.size() ; i++){temp = v[i] ; if(Exist(res,temp) == false) res.push_back(temp) ; } return res ; }
template < class T > vector <T> Parse(T temp){ vector <T> ans ; ans.clear() ; T s ; istringstream is(temp) ; while(is >> s){ ans.push_back(s) ; } return ans ; }
template < class T > string toString(T x) {stringstream s ; s << x; return s.str() ; }
template < class T > long long toInt(T x) {istringstream is(x) ; long long num  ; is >> num ; return num ; }

template< class T > inline void checkMin(T &a , T b){ if(b < a) a = b ; }
template< class T > inline void checkMax(T &a , T b){ if(b > a) a = b ; }

bool isLowerCase(char c){ return (c >= 'a' &&  c <= 'z') ; }
bool isUpperCase(char c){ return (c >= 'A' &&  c <= 'Z') ; }
char toLowerCase(char c){ return (isUpperCase(c) ? (c + 32) : c) ; }
char toUpperCase(char c){ return (isLowerCase(c) ? (c - 32) : c) ; }
bool isLetter ( char c ){ return (isUpperCase(c)) || (isLowerCase(c)) ; }
bool isDigit  ( char c ){ return (c >= '0' &&  c <= '9') ; }

/* Debug */
template < class T > void print(T ans){ for(unsigned int i = 0 ; i < ans.size() ; i++ ) cout << ans[i] << " " ;  cout << endl ; }
template < class T > void print2(T ans){ cout << ans ;  cout << endl ; }

typedef long long LL ;
#define ALL(a)              (a).begin(),(a).end()
#define SZ(v)               ((int)(v).size())
#define Clear(x,with)       memset(x , with , sizeof(x))
#define FOR(i,start,end)    for(int i = start ; i < end ; i++)
#define REP(i,start,end)    for(int i = start ; i >= end ; i--)
#define FOREACH(it,x)       for(__typeof((x).begin()) it = (x.begin()) ; it != (x).end() ; it++)

class ClassName
{
 public : Function
  {
   int ans = 0 ;
   return ans ; 
  }
};