Converting Vector Size to Integer in C++

This statement converts the size of the vector 'matches' into an integer value and stores it in the variable 'matches_size'. This conversion is necessary because the size of the vector is of type 'size_t', which is an unsigned integer type. Using 'size_t' directly can cause issues when performing arithmetic operations or comparisons with signed integer types. By casting the 'size_t' value to an 'int', we ensure compatibility with other integer types in our code.