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递归确实慢了啊!下面的程序可以优化吗?#include <iostream>
#include <string>
using namespace std;
string cat(int x)
{
int i;
string s,ans;
if (x==0)
{
return (s="-");
}
ans = cat(x-1);
string blank(ans.size(),' ');
ans = ans+blank+ans;
return ans;
}
int main()
{
int t;
while(1)
{
scanf("%d",&t);
cout << cat(t);
}
return 0;
}
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