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/* STL map应用
* Greedy 部分背包问题
* newplan 开发时间:08.5.13
*/
/*--------INCLUDES----------*/
#include <cstdlib>
#include <iostream>
#include <map>
#include <fstream>
#include <iomanip>
/*--------INCLUDES----------*/
/*---------MACROS-----------*/
#define INPUTFILE "bag.txt"
/*---------MACROS-----------*/
/*----------STD-------------*/
using std::ifstream;
using std::cout;
using std::endl;
using std::map;
using std::greater;
using std::ios;
using std::setw;
/*----------STD-------------*/
/*-------GLOBAL VAL---------*/
ifstream Fin;
int n;
int W;
int totalValue;
/*-------GLOBAL VAL---------*/
/*---------MAIN-------------*/
int main(int argc, char *argv[])
{
map<int,int,greater<int> > goods;
Fin.open(INPUTFILE);
int value;
int weight;
Fin>>W;
Fin>>n;
int i;
for(i=0;i<n;i++)
{
Fin>>value;
Fin>>weight;
goods[value]=weight;
}
for(map<int,int>::iterator it = goods.begin();it!=goods.end();it++)
{
cout<<setiosflags(ios::left)<<"value:"<<setw(4)<<it->first
<<" weight:"<<setw(4)<<it->second<<endl;
}
for(map<int,int>::iterator it = goods.begin();it!=goods.end();it++)
{
if(W-it->second>=0)
{
W-=it->second;
totalValue+=it->first*it->second;
cout<<"w="<<W<<" ";
}
else
{
totalValue+=W*it->first;
cout<<"totalValue:"<<totalValue<<endl;
break;
}
}
system("PAUSE");
return EXIT_SUCCESS;
}
/*---------MAIN-------------*/
BAG.TXT
100 10
3 43
5 22
6 4
4 67
2 3
45 2
4 2
42 24
41 4
34 55
vc :
CMD:
1. vcvars.bat
2. cl /FAs ***.cpp 注意要将VC98/bin下面的文件VCVARS.BAT带到 所要编译的CPP文件所在的文件夹之下
borlandc:
1.设置环境变量右击我的电脑进入高级环境进行系统:path的设置：加入*\Borland\BCC55\BIN;
2.在*\BIN文件夹下添加两个文件bcc32.cfg 文件内容为:
-I "*\Borland\BCC55\INCLUDES"
-L "*\BORLAND\BCC55\LIBS"
另外的一个文件名为：ilink32.cfg：
-L "*\BORLAND\BCC55\LIBS"
3.CMD:
BCC32 -S *CPP/C
gcc/g++:gcc for c file and g++ for cpp 只要安装了DEVCPP就可以使用g++/gcc
gcc -S *c
g++ -S *cpp
#include <functional>
#include <vector>
#include <algorithm>
#include <iostream>
using namespace std;
class out_times_x
{
private:
int multiplier;
public:
out_times_x(const int& k) : multiplier(k) { }
void operator()(const int& x) { cout << x * multiplier << " " << endl; }
};
int main ()
{
int sequence[5] = {1,2,3,4,5};
vector<int> v(sequence+0, sequence+5);
out_times_x f2(2);
for_each(v.begin(),v.end(),f2); // Apply function
system("pause");
return 0;
}
win32:DEV C++ 格式：
#include <iostream>
using namespace std;
int a=1;/*a,b 应当都是全局的*/
int b=10;
int main(int argc,char **argv)
{
cout<<sizeof(int)<<endl;
/*AT&T 规范 Not Intel*/
__asm("mov _b,%eax");//mov 的左边是源，右边是目标
__asm("mov %eax,_a");
cout<<a<<endl;
cout<<b<<endl;
cout<<"a+b="<<a+b<<endl;
getchar();
return(a-b);
}
win32:VC6.0格式:
#include <iostream>
using namespace std;
int main(int argc,char **argv)
{
/*int的长度和eax的长度一样都是4个字节*/
cout<<sizeof(int)<<endl;
int a=100;
int b=10;
/*Intel 规范*/
__asm{
mov eax,a;//eax 是目标，a 是源
add eax,b;
mov a,eax;
}
cout<<a<<endl;
cout<<"a+b="<<a<<endl;
return(a-b);
}
 #include <iostream>
#include <queue>//有priority_queue
using namespace std;
class cl
{
public:
int i;
};
bool operator>(const cl&a, const cl & b)
{
return a.i < b.i;
}
bool operator<(const cl&a,const cl &b)
{
return a.i>b.i;
}
int main()
{
priority_queue<cl,vector<cl>,greater<vector<cl>::value_type> > q;
cl a;
while(cin>>a.i)
{
q.push(a);
}
while(!q.empty())
{
cout<<q.top().i<<endl;
q.pop();
}
system("PAUSE");
return 1;
}
/*
Romberg Algorithm
开发者:newplan
开发日期:08.05.07
*/
/*=======================================*/
/*INCLUDES*/
#include <cstdlib>
#include <iostream>
#include <cmath>
/*=======================================*/
/*MACROS USED IN THIS FILE*/
#define MAX 20
#define PRECISION 0.000008
/*=======================================*/
/*DECLARE NAMES IN STL NAMESAPCE */
using std::cout;
using std::endl;
/*=======================================*/
/*CLASS FUNC (FUNCTION OBJECT): THE ORIGINAL FUNCTION WE WANT TO INTEGRAL*/
class func{
public:
func(double x=1.0):exp(x){}
double operator()(const double& dnum)const{return pow(dnum,exp);}
private:
double exp;
};
/*=======================================*/
/*CLASS ECHELONFUNC (FUNCTION OBJECT)梯形法的递推公式*/
class echelonFunc{
public:
echelonFunc(double begining,double ending,func & myfunc);
double operator()();
private:
double h;
int n;
double T;
func myfunc;
double begining;
double ending ;
};
/*=======================================*/
echelonFunc::echelonFunc(double begining,double ending,func & myfunc)
{
this->begining=begining;
this->ending=ending;
this->h=ending-begining;
this->n=0;
this->T=0;
this->myfunc=myfunc;//FUCNTION
}
/*------------------------------*/
/* INCREASE FUNCTION 递推函数*/
double echelonFunc::operator()()
{ if(this->n==0)
{
this->T=h*0.5*(myfunc(this->begining)+myfunc(this->ending));
this->n=1;
return this->T;
}
double len=0.5*h;
double sum=0;
int k=0;
for(k=0;k<this->n;k++)
{
sum+=myfunc(len);
len=len+h;
}
this->T=0.5*this->T+0.5*h*sum;
this->h/=2;
this->n*=2;
return this->T;
}
/*=======================================*/
/*THE MAIN CLASS IN THIS PROGRAM*/
class Romberg{
public:
Romberg(double begining,double ending,double exp);
~Romberg();
private:
void RombergCPU();/*THE MOST IMPORTANT FUNCTION IN THIS PROGRAM*/
echelonFunc *echol;
double T[MAX][MAX];/*STO THE ROMBERG TABLE*/
};
/*------------------------------*/
Romberg::Romberg(double begining ,double ending ,double paraexp)
{
func myfunc(paraexp);
echol = new echelonFunc(begining,ending,myfunc);
RombergCPU();
}
/*------------------------------*/
Romberg::~Romberg()
{
delete echol;
}
/*------------------------------*/
void Romberg::RombergCPU()
{ clock_t Start; //TIME STARAT
clock_t End; //TIME END
double *p[MAX];//WE USE THIS POINTER ARRAY TO ACCELERATE ALGOTITHM
double **q;
int i,j;
Start = clock();//TIME START FROM HERE
for(i = 0,q = p; q < p+MAX; q++,i++)
*q= &T[i][0];
double a,b,pows;
cout<<"-----------------------Romberg Algorithm---------------------"<<endl;
*p[0]=(*echol)();
cout<<" "<<*p[0]<<endl;
p[0]++;
do{
*p[0]=(*echol)();
cout<<" "<<*p[0];
p[0]++;
for(i=1;;i++)
{
pows=pow(4.0,double(i));
a=pows/(pows-1);
b=1/(pows-1);
*p[i]=a*(*(p[i-1]-1))-b*(*(p[i-1]-2));//ROMBERG ALGORITHM
cout<<" "<<*p[i];
if(p[i]==&T[i][0])
{
p[i]++;
break;
}
p[i]++;
}
cout<<endl;//fabs(T[i][0]-T[i-1][0])
}while(fabs(T[i][0]-T[i-1][0])>PRECISION);
End = clock();//TIME END HERE
cout<<"-------------------------------------------------------------"<<
endl<<" TIME SPEND:"<<(double)(End-Start)/CLOCKS_PER_SEC<<endl;
}
/*=======================================*/
/*MAIN FUNCTION*/
int main(int argc, char *argv[])
{
Romberg romberg(0,1,1.5);//ROMBERG API :BEGIN(0) END(1) EXP(1.5)
system("PAUSE");
return EXIT_SUCCESS;
}
/*
*用来测试STL hash_map
*简单例子2008.5.5
*/
#include <cstdlib>
#include <iostream>
#include <string>
#include <hash_map.h>/*因为hash_map暂不为CPP标准所以没办法写为<hash_map>*/
/*-------------------------------------------*/
using std::cout;
using std::endl;
using std::string;
/*-------------------------------------------*/
/*函数类
*作为hash_map的hash函数
*string没有默认的hash函数
*/
class str_hash{
public:
size_t operator()(const string& str) const
{
unsigned long __h = 0;
for (size_t i = 0 ; i < str.size() ; i ++)
__h = 5*__h + str[i];
return size_t(__h);
}
};
/*-------------------------------------------*/
/*函数类
*作为hash_map的比较函数 )
*(查找的时候不同的key往往可能对用到相同的hash值
*/
class str_compare
{
public:
bool operator()(const string& str1,const string& str2)const
{return str1==str2;}
};
/*-------------------------------------------*/
int
main(int argc, char *argv[])
{
hash_map<string,string,str_hash,str_compare> myhash;
myhash["google"]="newplan";
myhash["baidu"]="zhaoziming";
if(myhash.find("google")!=myhash.end())
cout<<myhash["google"]<<endl;
system("PAUSE");
return EXIT_SUCCESS;
}
/*-------------------------------------------*/
#include <stdio.h>
#include <ctype.h>
int lookahead;
void error()
{
printf("synatax error\n");
exit(1);
}
void match(int t)
{
if(lookahead==t)
lookahead=getchar();
else
error();
}
void term()
{
if(isdigit(lookahead))
{
putchar(lookahead);
match(lookahead);
}
else error();
}
void exptr()
{
term();
while(1)
{
if(lookahead=='+')
{
match('+');term();putchar('+');
}
else if(lookahead=='-')
{
match('-');term();putchar('-');
}
else break;
}
}
int main(int argc, char *argv[])
{
lookahead=getchar();
exptr();
putchar('\n');
system("PAUSE");
return 0;
}
#include "apue.h"
#include "semaphore.h"
#include "pthread.h"
#define N 5
static int necs;
static sem_t *forks;
void *
takeFork(int i)
{
if(i==N-1)
{
sem_wait(&forks[0]);
sem_wait(&forks[i]);
}
else
{
sem_wait(&forks[i]);
sem_wait(&forks[i+1]);
}
}
void *
putFork(int i)
{
if(i==N-1)
{
sem_post(&forks[0]);
sem_post(&forks[i]);
}
else
{
sem_post(&forks[i]);
sem_post(&forks[i+1]);
}
}
void
thinking(int i,int necs)
{
printf("pholosopher %d is thinking\n",i);
sleep(necs);
}
void
eating(int i,int necs)
{
printf("pholosopher %d is eating\n",i);
sleep(necs);
}
void *
philosopher(void *n)
{
int i=(int )n;
while(1)
{
thinking(i,necs);
takeFork(i);
eating(i,necs);
putFork(i);
}
}
//============================main function
int
main(int argc,char *argv[])
{
pthread_t tid;
if(argc==1)
necs=2;
else if(argc ==2)
necs=atoi(argv[1]);
else return 1;
forks=(sem_t*)malloc(N*sizeof(sem_t));
int i;
for(i=0; i<N; i++)
sem_init(forks+i,0,1);
int status;
for(i=0;i<N;i++)
{
status=pthread_create(&tid,NULL,philosopher,(void*)i);
if(status<0)
err_sys("create error!");
}
pthread_join(tid ,NULL);
return 0;
}
#include "apue.h"
#include "lock.h"
#include "lock.c"
/*define some important variable*/
/*=======================================*/
pid_t pid;
static char *forks[5]={
"fork0", "fork1", "fork2" ,"fork3" ,"fork4"
};
static int necs;
#define N 5
/*======================================*/
void takeFork(int i)
{
if(i==N-1)
{
lock(forks[0]);
lock(forks[i]);
}
else
{
lock(forks[i]);
lock(forks[i+1]);
}
}
void putFork(int i)
{
if(i==N-1)
{
unlock(forks[0]);
unlock(forks[i]);
}
else
{
unlock(forks[i]);
unlock(forks[i+1]);
}
}
int
thinking(int i,int necs){
printf("pholosopher %d is thinking\n",i);
return sleep(necs);
}
int
eating(int i,int necs)
{printf("pholosopher %d is eating\n",i);
return sleep(necs);
}
void philosopher(int i)
{
while(1)
{
thinking(i,necs);
takeFork(i);
eating(i,necs);
putFork(i);
}
}
int
main(int argc ,char *argv[])
{
if(argc=1)
necs=2;
else if(argc==2)
necs=atoi(argv[1]);
else return 0;
int i;
for(i=0;i<N;i++)
{
pid=fork();
if(pid ==0)
philosopher(i);
}
return 0;
}
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