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为什么输出时用putchar()不会超时而用printf("%c")就会超时#include <stdio.h>
#include <math.h>
#include <string.h>
char a[729][729];
void fill(int x,int y,int n)
{
if (n==1)
a[x][y]='X';
else
{
int t=(int)pow(3,n-2);
fill(x,y,n-1);
fill(x,y+2*t,n-1);
fill(x+t,y+t,n-1);
fill(x+2*t,y,n-1);
fill(x+2*t,y+2*t,n-1);
}
}
int main()
{
memset(a,' ',sizeof(a));
fill(0, 0, 7);
int i,j,n;
while(1)
{
scanf("%d", &n);
if (n==-1) return 0;
int m=(int)pow(3,n-1);
for (i=0;i<m;i++)
{
for(j=0;j<m;j++)
putchar(a[i][j]);
//改为printf("%c",a[i][j])就会超时
putchar('\n');
}
printf("-\n");
}
return 0;
}
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