Compilare: user.cpp: In function ‘void read()’: 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:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void solve()’: user.cpp:39: warning: comparison between signed and unsigned integer expressions /tmp/ccSnHGck.o: In function `read()': user.cpp:(.text+0x2d8): warning: the `gets' function is dangerous and should not be used.