Compilare: user.cpp: In function ‘void read()’: user.cpp:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void solve()’: user.cpp:59: warning: unused variable ‘mni’ user.cpp: In function ‘double cost(int)’: user.cpp:46: warning: ‘i1’ may be used uninitialized in this function