Compilare: user.cpp: In function ‘void Check(int, int)’: user.cpp:63: warning: unused variable ‘j’ user.cpp:63: warning: unused variable ‘k’ user.cpp:91: warning: unused variable ‘M11’ user.cpp:92: warning: unused variable ‘M22’ user.cpp: In function ‘void Solve()’: user.cpp:150: warning: comparison between signed and unsigned integer expressions user.cpp:131: warning: unused variable ‘l’ user.cpp: In function ‘int main()’: user.cpp:156: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:157: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:159: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:162: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result