Compilare: user.cpp: In function ‘int query(int, int, int)’: user.cpp:26: warning: unused variable ‘v1’ user.cpp:26: warning: unused variable ‘v2’ user.cpp: In function ‘void read()’: user.cpp:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void solve()’: user.cpp:52: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result