Using the declarations

typedef vector<string> Row;
typedef vector<Row> Matrix;

write a function

int number_of_words(const Matrix& m, char c, int k);

that returns how many words *w* of the Matrix *m*
have the character *c* at the position *k*,
that is, fulfil *p[k]* = *c* (when *p[k]* exists).
Take into account that the “matrix” *m* is not necessary rectangular,
i.e., some rows may be larger than others.

Precondition

*k* ≥ 0

Observation You only need to submit the required procedure; your main program will be ignored.

Information

- Author
- Salvador Roura
- Language
- English
- Translator
- Carlos Molina
- Original language
- Catalan
- Other languages
- Catalan
- Official solutions
- C++
- User solutions
- C++