Compilare: user.cpp: In function ‘int read(std::vector<char>&, bool*)’: user.cpp:15:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(f[ch]==0) ^ user.cpp:17:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[ch]=1; ^ user.cpp: In function ‘bool Fact2(std::vector<char>&)’: user.cpp:40:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] ans=((conf&(1<<lg[V[pos]]))>0); ^ user.cpp: In function ‘int main()’: user.cpp:89:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(f1[ch]!=f2[ch]) ^ user.cpp:89:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(f1[ch]!=f2[ch]) ^ user.cpp:93:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(f1[ch]==1){ ^ user.cpp:94:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] lg[ch]=cnt; ^ user.cpp:70:9: warning: unused variable ‘i’ [-Wunused-variable] int i,cnt1,cnt2,cnt; ^ user.cpp:74:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&n); ^