5-10.cpp

Accelerated C++ 课后练习题 本人自己完成、可供参考

#include<iostream>
#include<string>
#include<vector>
#include<cctype>
#include<algorithm>
using namespace std;

vector<string> split(const string& s)
{
	vector<string> ret;
	typedef string::size_type string_size;
	string_size i=0;

	//ivarinant: we have processed characters [original value of i, i)
	while(i!=s.size())
	{
		//ignore leading blanks
		//invariant: characters in range [original i, current i) are all spaces
		while(i!=s.size()&&isspace(s[i]))
			++i;
		//find end of next word
		string_size j=i;
		//invariant: none of the characters in range [original j,current j)is a space
		while(j!=s.size()&&!isspace(s[j]))
			j++;
		//if we found some nonwhitespace characters
		if(i!=j)
		{
			//copy from s starting at i and taking j-i chars
			ret.push_back(s.substr(i,j-i));
			i=j;
		}
	}
	return ret;
}

string::size_type width(const vector<string>& v)
{
	string::size_type maxlen=0;
	for(vector<string>::size_type i=0;i!=v.size();++i)
		maxlen=_MAX(maxlen,v[i].size());
	return maxlen;
}

vector<string> frame(const vector<string>& v)
{
	vector<string> ret;
	string::size_type maxlen=width(v);
	string border(maxlen+4,'*');

	//write the top border
	ret.push_back(border);

	//write each interior row, bordered by asterisk and a space
	for(vector<string>::size_type i=0;i!=v.size();++i)
	{
		vector<string>::size_type l=maxlen-v[i].size();
		ret.push_back("* " + string(l/2,' ')+ v[i] + string(l-l/2,' ') + " *");
	}

	//write the bottom  border
	ret.push_back(border);
	return  ret;
}

bool ugrade(const string s)
{
	return s<"a";
}

vector<string> upper(vector<string>& v)
{
	vector<string>::iterator iter=stable_partition(v.begin(),v.end(),ugrade);
	vector<string> u(iter,v.end());
	v.erase(iter,v.end());
	return u;
}




bool is_palindrome(const string& s)
{
	return equal(s.begin(),s.end(),s.rbegin());
}

vector<string> Palindromes(vector<string>& v)
{
	vector<string>::iterator iter=stable_partition(v.begin(),v.end(),is_palindrome);
	vector<string> Palindromes(iter,v.end());
	v.erase(iter,v.end());
	return Palindromes ;
}


int main()
{
	string s;
	getline(cin,s);					//int put a line string
	vector<string> v=split(s);		//split string to words
	vector<string> u=Palindromes(v);	
	vector<string> w1=frame(v);
	vector<string> w2=frame(u);

	for(vector<string>::size_type i=0;i<w1.size();++i)
		cout<<w1[i]<<endl;

	for(i=0;i<w2.size();++i)
		cout<<w2[i]<<endl;
  return 0;	
}