Compilare: main.cpp: In function 'bool termen1()': main.cpp:41:20: warning: array subscript has type 'char' [-Wchar-subscripts] rez1 = val[x[p]]; ^ main.cpp: In function 'int main()': main.cpp:53:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < s.size(); i++ ) { ~~^~~~~~~~~~ main.cpp:71:13: warning: array subscript has type 'char' [-Wchar-subscripts] val[ch] = !val[ch]; ^ main.cpp:71:24: warning: array subscript has type 'char' [-Wchar-subscripts] val[ch] = !val[ch]; ^