Submission #2749729

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
string s;int k;
set<string>tt;
int main(){
	std::ios::sync_with_stdio(false);
	cin>>s>>k;
	int len=s.size();
	for(int i=1;i<=min(len,k);i++){
		for(int j=0;j<len;j++){
			tt.insert(s.substr(j,i));
			auto it=tt.end();it--;
			if(tt.size()>k) tt.erase(it);
		}
	}
	auto it=tt.begin();int num=1;
	while(num<k) it++,num++;
	cout<<*it<<endl;
	return 0;
} 

Submission Info

Judge Result