Compilare: user.cpp: In function ‘int read()’: user.cpp:13: warning: unused variable ‘ok’ user.cpp:27: warning: no return statement in function returning non-void user.cpp:14: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int qsort(int, int)’: user.cpp:46: warning: no return statement in function returning non-void user.cpp: In function ‘int sort()’: user.cpp:64: warning: no return statement in function returning non-void user.cpp: In function ‘int solve()’: user.cpp:77: warning: no return statement in function returning non-void