Building for UN

The United Nations has decided to build a new headquarters in Saint Petersburg, Russia. It will have a form of a rectangular parallelepiped and will consist of several rectangular floors, one on top of another. Each floor is a rectangular grid of the same dimensions, each cell of this grid is an office.

Two offices are considered adjacent if they are located on the same floor and share a common wall, or if one’s floor is the other’s ceiling.

The St. Petersburg building will host n national missions. Each country gets several offices that form a connected set.

Moreover, modern political situation shows that countries might want to form secret coalitions. For that to be possible, each pair of countries must have at least one pair of adjacent offices, so that they can raise the wall or the ceiling they share to perform secret pair-wise negotiations just in case they need to.

You are hired to design an appropriate building for the UN.

Input
The input file consists of a single integer number n (1 ≤ n ≤ 50) — the number of countries that are hosted in the building.

Output
On the first line of the output file write three integer numbers h, w, and l — height, width and length of the building respectively.

h descriptions of floors should follow. Each floor description consists of l lines with w characters on each line. Separate descriptions of adjacent floors with an empty line.

Use capital and small Latin letters to denote offices of different countries. There should be at most 1 000 000 offices in the building. Each office should be occupied by a country. There should be exactly n different countries in the building. In this problem the required building design always exists.

Sample Input
4
Sample Output
2 2 2
AB
CC

zz
zz

题目大意：给你n个国家，要你在一个建筑里为这些国家排列办公室，要求是每个国家至少有两间办公室是相邻，相邻的概念是要么在同一层有相同的墙壁，要么是上下层，下层的天花板是上层的地板
输出：h，w，l，h是建筑的高度，每层有l条，每条有w个办公室。每层之间有一个空行。

其实只需要看看这两组输出就行：
2 2 2
AB
AA

AB
BB

4 4 4
ABCD
AAAA

ABCD
BBBB

ABCD
CCCC

ABCD
DDDD

这是符合题意的样例；代码就很简单了；

#include<iostream>#include<cstdio>#include<cstring>using namespace std;int main(){    int n;    char s[100];    while(~scanf("%d",&n))    {        printf("%d %d 2\n",n,n);        for(int i=0; i<n; i++)        {            if(i<=25)                s[i]='A'+i;            else                s[i]='a'+i-26;        }        for(int j=0; j<n; j++)        {            for(int i=0; i<n; i++)                cout<<s[i];            cout<<endl;            for(int i=0; i<n; i++)            {                if(j<26)                    printf("%c",('A'+j));                else                    printf("%c",('a'+j-26));            }            cout<<endl;            cout<<endl;        }    }    return 0;}