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就是四条边同时扩张就可以了#include <iostream>
#include <cstdio>
#include <string>
#include <string.h>
#include <vector>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <queue>
#include <set>
#include <stack>
#include <functional>
#include <fstream>
#include <sstream>
#include <iomanip>
#include <numeric>
#include <cassert>
#include <bitset>
#include <stack>
#include <ctime>
#include <list>
using namespace std;
int map[70][70];
int main()
{
int m,n,i=1,j=1;
scanf("%d%d",&m,&n);
memset(map,0,sizeof(map));
int time=1;
char c='A';
map[1][1]='A';
while(time<m*n)
{
while(j+1<=n && !map[i][j+1])
{
if(c>=90)
c-=26;
map[i][++j]=++c;
++time;
}
while(i+1<=m && !map[i+1][j])
{
if(c>=90)
c-=26;
map[++i][j]=++c;
++time;
}
while(j-1>=1 && !map[i][j-1])
{
if(c>=90)
c-=26;
map[i][--j]=++c;
++time;
}
while(i-1>=1 && !map[i-1][j])
{
if(c>=90)
c-=26;
map[--i][j]=++c;
++time;
}
}
for(i=1; i<=m; i++)
{
for(j=1; j<=n; j++)
printf(" %c",map[i][j]);
printf("\n");
}
return 0;
}
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