PAT 1124

#include<cstdio>#include<iostream>#include<string>#include<string.h>#include<algorithm>#include<map>using namespace std;const int maxn=1010;map<string,bool> flag;int main(){	string a[maxn];	int m,n,s;	cin>>m>>n>>s;	for(int i=1;i<=m;i++)	{		cin>>a[i];		flag[a[i]]=false;	}	if(s>m)		cout<<"Keep going...";	for(int i=s;i<=m;i+=n)	{		if(flag[a[i]]==false)		{			flag[a[i]]=true;			cout<<a[i]<<endl;		}		else			i=i-n+1;	}	system("pause");	return 0;}