poj2039

#include<iostream>#include<fstream>using namespace std;int main(){    //ifstream cin("1.txt");    int n;    while(cin>>n&&n!=0){        string s;        cin>>s;        char a[s.length()/n][n];        for(int i=0;i<s.length();++i){            int r=i/n;            int c=i%n;            if(r%2==1)                c=n-1-c;            a[r][c]=s[i];        }        for(int i=0;i<n;++i)            for(int j=0;j<(s.length()/n);++j)                cout<<a[j][i];        cout<<endl;    }    return 0;}