Compilare: user.cpp: In function ‘int main()’: user.cpp:55:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] vf[str[pos[i]]]++; ^ user.cpp:61:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(vf[str[i]]==0){ ^ user.cpp:63:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] newpos[str[m]].push_back(m); ^ user.cpp:66:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] vf[str[i]]--; ^ user.cpp:40:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&n,&x); ^