Submission #3928427

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Source Code Expand

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <math.h>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <iomanip>
#include <map>
#include <utility>
#include <numeric>
#include <typeinfo>

using namespace std;

#define MOD 1000000007

int main(){
  string s;
  cin >> s;
  int K;
  cin >> K;

  vector<string> x;
  for(int c='a';c<='z';c++){
    for(int i=0;i<s.size();i++){
      if((int)s.at(i)==c){
        string a;
        for(int j=i;j<s.size();j++){
          a+=s.at(j);
          x.push_back(a);
        }
      }
    }
    sort(x.begin(),x.end());
    x.erase(unique(x.begin(),x.end()),x.end());
    if(x.size()>=K){
      cout << x.at(K-1) << endl;
      return 0;
    }
  }

  return 0;
}

Submission Info

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