Compilare: user.cpp: In function ‘int main()’: user.cpp:16:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] val[var[i-1]]=!val[var[i-1]]; ^ user.cpp:16:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] val[var[i-1]]=!val[var[i-1]]; ^ user.cpp: In function ‘int rezolva()’: user.cpp:44:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(; c<strlen(s);) ^ user.cpp:88:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] else x[++x[0]]=val[s[c++]]; ^