Compilare: user.cpp: In function ‘int main()’: user.cpp:21:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d\n",&m,&n); ^ user.cpp:23:25: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets (s,500000,fin); ^ user.cpp:49:18: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] w[mid]++; ^