Compilare: user.cpp: In function ‘void mat()’: user.cpp:27: warning: comparison between signed and unsigned integer expressions user.cpp:37: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:54: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int minim(int, int, int)’: user.cpp:15: warning: control reaches end of non-void function