Compilare: user.cpp: In function ‘void read()’: user.cpp:17: warning: unused variable ‘j’ user.cpp:18: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void solve()’: user.cpp:25: warning: unused variable ‘j’ user.cpp: In function ‘int main()’: user.cpp:62: warning: unused variable ‘i’ user.cpp:62: warning: unused variable ‘j’