代码对齐--string|stream

https://vjudge.net/contest/185301#problem/A

学习了好多新函数，只要关注每个单词的列宽就行了。自动切分太厉害了吧~

 #include<iomanip>
 #include<stdio.h>
 #include<string.h>
 #include<math.h>
 #include<iostream>
 #include<stdlib.h>
 #include<algorithm>
 #include<queue>
 #include<vector>
 #include<string>
 #include<set>
 #include<cctype>
 #include<sstream>
 #define mem(a) memset(a,0,sizeof(a))
 #define LL long long
 #define ull unsigned long long
 #define inf 0x3f3f3f3f
 using namespace std;
 const int N=2e4+;
 int n,m;
 int a[N],b[N],c[N][N];
 vector<string>s[];

 int main()
 {
   string line,tem;
   int v=,c[],u=;
   mem(c);
   while(getline(cin,line))
   {
     istringstream ans(line); //自动切分|空格|读入
     while(ans>>tem)
     {
         c[v]=max(c[v],(int)tem.size());
         s[u].push_back(tem);
         v++;
     }
     v=,u++;
   }
   cout<<setiosflags(ios::left);//左对齐
   for(int i=;i<u;i++)
   {
       int j;
       for(j=;j<s[i].size()-;j++)
         {cout <<setw(c[j]+)<<s[i][j];} // 设置s[i][j]域宽

       cout<<s[i][j]<<endl;
   }

  return ;
 }