Submission #2495064

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef complex<double> point;
#define mapii map<int, int>
#define debug(a) cout << #a << ": " << a << endl
#define debuga1(a, l, r) fto(i, l, r) cout << a[i] << " "; cout << endl
#define fdto(i, r, l) for(int i = (r); i >= (l); --i)
#define fto(i, l, r) for(int i = (l); i <= (r); ++i)
#define forit(it, var) for(__typeof(var.begin()) it = var.begin(); it != var.end(); it++)
#define forrit(rit, var) for(__typeof(var.rbegin()) rit = var.rbegin(); rit != var.rend(); rit++)
#define ii pair<int, int>
#define iii pair<int, ii>
#define ff first
#define ss second
#define mp make_pair
#define pb push_back
#define maxN 100005
#define MOD 1000
#define oo 1000000000000000007LL
#define sz(a) (int)a.size()

const double PI = acos(-1.0);

double fRand(double fMin, double fMax)
{
    double f = (double)rand() / RAND_MAX;
    return fMin + f * (fMax - fMin);
}

template <class T>
T min(T a, T b, T c) {
    return min(a, min(b, c));
}

template <class T>
T max(T a, T b, T c) {
    return max(a, max(b, c));
}

int n, k;
string s;
set<string> ss;

int main () {
    cin >> s;
    cin >> k;
    n = s.length();

    fto(len, 1, 5) {
        fto(l, 0, n-len) ss.insert(s.substr(l, len));
    }

    fto(i, 1, k-1) ss.erase(ss.begin());
    cout << *ss.begin();

    return 0;
}

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