Compilare: main.cpp: In function 'int main()': main.cpp:50:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<litere1.size();i++) fr1[litere1[i]]=1; ~^~~~~~~~~~~~~~~ main.cpp:50:57: warning: array subscript has type 'char' [-Wchar-subscripts] for(int i=0;i<litere1.size();i++) fr1[litere1[i]]=1; ^ main.cpp:51:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<litere2.size();i++) fr2[litere2[i]]=1; ~^~~~~~~~~~~~~~~ main.cpp:51:57: warning: array subscript has type 'char' [-Wchar-subscripts] for(int i=0;i<litere2.size();i++) fr2[litere2[i]]=1; ^