一开始没怎么看懂题目，原来就是M字符就是这一列的宽度为M个字符，包括空格。

1 #include
     
       2 #include
      
        3 #include
       
         4 using namespace std; 5  6 int main() 7 { 8     string filename[110]; 9     int n;10     while (cin >> n)11     {12         int cols, rows;13         int M = 0;14         for (int i = 0; i < n; i++)15         {16             cin >> filename[i];17             M = max(M, (int)filename[i].length());18         }19         cols = (60 - M) / (M + 2) + 1;20         rows = (n - 1) / cols + 1;21         sort(filename, filename + n);22         for (int i = 1; i <= 60; i++)23             cout << "-";24         cout << endl;25         for (int i = 0; i < rows; i++)26         {27             for (int j = 0; j < cols; j++)28             {29                 int t = j * rows + i;30                 if (t>=n)31                     continue;32                 cout << filename[t];33                 for (int k = 1; k <= M - filename[t].length();k++)34                 {35                     cout << " ";36                 }37                 if (j < cols - 1)38                     cout << "  ";39             }40             cout << endl;41         }42     }43     return 0;44 }