# 425 Word Squares

* Unfinished, current implementation:
* But the idea now is not generate the universal set of size of the word, and valid them.
* O(n^n);

```cpp
vector<vector<string>> sub_perms(vector<vector<string>> &cur_list, string &word)
{
    vector<vector<string>> new_list;

    for (int i = 0; i < cur_list.size(); i++) {
        for (int j = 0; j <= cur_list[i].size(); j++) {
            vector<string> temp = cur_list[i];
            temp.insert(temp.begin() + j, word);
            new_list.push_back(temp);
        }
    }
    return new_list;
}

vector<vector<string>> generate_permutations(vector<string> &words)
{
    if (words.empty()) return vector<vector<string>>();
    vector<vector<string>> all_perms = { { words[0] } };

    for (int i = 1; i < words.size(); i++) {
        all_perms = sub_perms(all_perms, words[i]);
    }

    return all_perms;
}

bool is_word_square(vector<string> &ws)
{
    print(ws);
    for (int row = 0; row < ws.size(); row++) {
        string row_word = ws[row];
        cout << row_word; pause();
        for (int col = 0; col < ws.at(row).size(); col++) {
            cout << ws[col][row]; pause();
            if (ws[col][row] != row_word[col]) return false;
        }
    }
    return true;
}

vector<vector<string>> wordSquares(vector<string>& words) 
{
    vector<vector<string>> all_perms = generate_permutations(words);
    vector<vector<string>> valid_ws;
    for (int vec = 0; vec < all_perms.size(); vec++) {
        if (is_word_square(all_perms[vec])) 
            valid_ws.push_back(all_perms[vec]);
    }

    return valid_ws;
}


int main()
{
    vector<string> test = { "abat","baba","atan","atal" };
    print2d(wordSquares(test));

    test = { "area","lead","wall","lady","ball" };
    print2d(wordSquares(test));

    test = { "ball","area","lead","lady" };
    print2d(wordSquares(test));
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://maksimdan.gitbook.io/interview-practice-problems/leetcode_sessions/425-word-squares.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.