Compilare: user.cpp: In function ‘void mat()’: user.cpp:22: warning: comparison between signed and unsigned integer expressions user.cpp:31: warning: comparison between signed and unsigned integer expressions user.cpp:17: warning: unused variable ‘x’ user.cpp:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:20: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:27: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp: In function ‘int main()’: user.cpp:53: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result 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:13: warning: control reaches end of non-void function /tmp/ccFji0o1.o: In function `mat()': user.cpp:(.text+0x12f): warning: the `gets' function is dangerous and should not be used.