Compilare: main.cpp: In function 'bool si()': main.cpp:41:25: warning: array subscript has type 'char' [-Wchar-subscripts] r=fr[expresie[p]]; ^ main.cpp: In function 'void form()': main.cpp:71:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.size();i++) ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:80:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ~^~~~~~~~~ main.cpp:94:13: warning: array subscript has type 'char' [-Wchar-subscripts] fr[x]=!fr[x]; ^ main.cpp:94:20: warning: array subscript has type 'char' [-Wchar-subscripts] fr[x]=!fr[x]; ^ main.cpp: In function 'bool si()': main.cpp:46:1: warning: control reaches end of non-void function [-Wreturn-type] } ^