Compilare: user.cpp: In function ‘int main()’: user.cpp:178:9: warning: unused variable ‘x’ [-Wunused-variable] int x,y; ^ user.cpp:178:11: warning: unused variable ‘y’ [-Wunused-variable] int x,y; ^ user.cpp:153:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d\n",&n); ^ user.cpp:158:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(v[i]+1,Q,in); ^