Compilare: user.cpp: In function ‘void read()’: user.cpp:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void solve()’: user.cpp:53: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:84: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result