Compilare: user.cpp: In function ‘void read()’: user.cpp:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void tare_conex(int)’: user.cpp:38: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int df(int)’: user.cpp:67: warning: comparison between signed and unsigned integer expressions user.cpp:71: warning: no return statement in function returning non-void user.cpp: In function ‘void write(int)’: user.cpp:97: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void solve()’: user.cpp:112: warning: comparison between signed and unsigned integer expressions user.cpp:117: warning: comparison between signed and unsigned integer expressions user.cpp:123: warning: comparison between signed and unsigned integer expressions user.cpp:104: warning: unused variable ‘ok’