PAT甲1124 Raffle for Weibo Followers

题意

给定M个字符串（同一字符串可重复出现），从第S个每隔N个地选取字符串，若该字符串已被选取，则选取下一个。

源码

#include<iostream>
#include<map>
#include<vector>
using namespace std;
map<string,bool>winBefore;
vector<string>winner;
vector<string>followers;
int main(){
	int n,m,k;
	cin>>n>>m>>k;
	for(int i=0;i<n;i++){
		string name;
		cin>>name;
		followers.push_back(name);
	}
	for(int i=k-1;i<n;){
		if(winBefore.find(followers[i])!=winBefore.end()){
			i++;
			continue;
		}else{
			winBefore[followers[i]]=true;
			winner.push_back(followers[i]);
			i+=m;
		}
	}
	if(winner.size()==0){
		cout<<"Keep going..."<<endl; 
	}else{
		for(int i=0;i<winner.size();i++){
			cout<<winner[i]<<endl;
		}
	}
}