Compilare: user.cpp: In function ‘void mat()’: user.cpp:23: warning: comparison between signed and unsigned integer expressions user.cpp:32: warning: comparison between signed and unsigned integer expressions user.cpp:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:21: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp: In function ‘int main()’: user.cpp:48: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:49: 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:14: warning: control reaches end of non-void function /tmp/cc2xFTCH.o: In function `mat()': user.cpp:(.text+0x12f): warning: the `gets' function is dangerous and should not be used.