poj 2876 Cantoring Along

#include<iostream>#include<string>using namespace std;string s[13];int main(){    string tem;    int i;    s[0] = "-";    for(i = 1; i < 13; ++ i)    {        s[i] += s[i-1];        s[i] += s[i-1];        s[i] += s[i-1];        fill_n(s[i].begin()+s[i-1].length(),s[i-1].length(),' ');    }    while(cin>>i)    {        cout<<s[i]<<endl;    }}