Compilare: user.cpp: In function ‘int main()’: user.cpp:136:7: warning: unused variable ‘st’ [-Wunused-variable] int st = first_good_pos(l,r),dr = last_good_pos(l,r); ^~ user.cpp:136:32: warning: unused variable ‘dr’ [-Wunused-variable] int st = first_good_pos(l,r),dr = last_good_pos(l,r); ^~ user.cpp:101:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d\n",&n,&q); ^ user.cpp:102:25: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s + 1,NMAX + 2,f); ^ user.cpp:129:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&l,&r); ^