Submission #2831874

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

string st;
vector<string> ans2;
set<string> ans;
int k;

int main() {
  int i, j, now = 0;
  cin >> st >> k;
  while(ans.size() < k) {
    for(i = 0; i < st.size(); ++i) {
      if(st[i] == now + 'a') {
        string x;
        for(j = 0; j < k; ++j) {
          x += st[i + j];
          ans.insert(x);
          if(i + j == st.size() - 1) break;
        }
      }
    }
    ++now;
  }
  now = 1;
  set<string>::iterator it = ans.begin();
  for(i = 1; i < k; ++i) it++;
  cout << *it << endl;
  return 0;
}

Submission Info

Judge Result