Compilare: user.cpp: In function ‘void read_(int&)’: user.cpp:6: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void print_matr_2x2(matr_2x2)’: user.cpp:77: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long long int’ user.cpp:77: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long long int’ user.cpp:77: warning: format ‘%d’ expects type ‘int’, but argument 4 has type ‘long long int’ user.cpp:77: warning: format ‘%d’ expects type ‘int’, but argument 5 has type ‘long long int’ user.cpp: In function ‘int main()’: user.cpp:89: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:90: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result