> 程序如下：
> #include <iostream>
> #include <string>
> #include <sstream>
> #include <vector>
> #include <algorithm>
> using namespace std;
> const int MAX=2000;
> vector<string> words[MAX];
> vector<int> length; //每一列单词格数
> int main()
> {
> 	string s;
> 	int cnt=0;
> 	while(getline(cin,s)) //Input
> 	{
> 		stringstream ss(s);
> 		string str;
> 		int kase=1,n=0;
> 		while(ss>>str)
> 		{
> 			if(length.size()<kase)
> 			{
> 				length.push_back(str.length());
> 				kase++;
> 			}else{
> 				length[n]=max(length[n],(int)str.length());
> 			}
> 			words[cnt].push_back(str);
> 			n++;
> 		}
> 		cnt++;
> 	}
> 	for(int i=0;i<cnt;i++)
> 	{
> 		int len1=words[i].size();
> 		for(int j=0;j<len1;j++)
> 		{
> 			cout<<words[i][j];
> 			if(j!=len1-1)
> 			{
> 				int len2=words[i][j].length();
> 				for(int k=len2;k<length[j]+1;k++) //多输出一个空格
> 					cout<<' ';
> 			}
> 		}
> 		cout<<endl;
> 	}
> 	return 0;
> }