hdu 1200 To and Fro
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没什么好说的。。。
#include <iostream>#include<string>using namespace std;int main(){//freopen("in.txt","r",stdin);char str[205];char a[200][25];int n,f;while(cin>>n&&n){getchar();cin>>str;int i=0,j=0,k;f=1;while(str[i]){if(f==1)for(k=0;str[i]&&k<n;k++,i++)a[j][k]=str[i];elsefor(k=n-1;str[i]&&k>=0;k--,i++)a[j][k]=str[i];f=-f;j++;}f=-f;if(f==1)while(k<n)a[j-1][k++]='0';elsewhile(k>=0)a[j-1][k--]='0';for(i=0;i<n;i++)for(k=0;k<j;k++)if(a[k][i]!='0')cout<<a[k][i];cout<<endl;}return 0;}
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