Function main

String Algorithms/Substring Order I.cpp:74–88

}

int main(){
    scanf(" %s %lld", S, &K);
    N = (int) strlen(S);

    init();
    for(int i = 0; i < N; i++)
        extend(S[i]);
    calc();

    dfs(0, K-1);
    int M = (int) ans.size();
    for(int i = 0; i < M; i++)
        printf("%c", ans[i]);
    printf("\n");
}