Compilare: user.cpp: In function ‘int main()’: user.cpp:25:9: warning: unused variable ‘ok’ [-Wunused-variable] int ok,j,nrap=0,q=m-n; ^ user.cpp:25:12: warning: unused variable ‘j’ [-Wunused-variable] int ok,j,nrap=0,q=m-n; ^ user.cpp:10:23: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(a,2000010,f); ^ user.cpp:11:23: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(b,2000010,f); ^