Compilare: user.cpp: In function ‘int main()’: user.cpp:99:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(good[c]) acc.push_back(c); ^ user.cpp:100:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!good[c] && acc != "") add(acc, i), acc = "", num[i]++; ^ user.cpp:93:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d%d", &n, &a, &r, &k); ^