1200 to and fro.cpp

威士忌的HDU题解.大概有260多题的源码。对于学习非常有好处。

/*
1200 To and Fro
Time Limit : 1000 ms  Memory Limit : 32768 K  Output Limit : 256 K

GUN C++
*/
#include <iostream>
#include <string>
using namespace std;

const int sMax=200;

int main()
{
    int t,n,ca,len,cb;
    bool flag;
    char strin[sMax];
    char strout[sMax],*pnow;
    while(cin>>n && n>0)
    {
        cin>>strin;
        len=strlen(strin);
        for(ca=0,pnow=strout;ca<n;ca++)
        {
            for(cb=ca,flag=false;cb<len; )
            {
                *pnow=strin[cb];
                pnow++;
                if(flag==false)
                {   cb+=2*(n-ca)-1;flag=true;}
                else
                {   cb+=2*ca+1;flag=false;}
            }
        }
        *pnow='\0';
        cout<<strout<<endl;
    }
    return 0;
}