Compilare: main.cpp: In function 'int main()': main.cpp:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<b.size(); i++) ~^~~~~~~~~ main.cpp:14:16: warning: array subscript has type 'char' [-Wchar-subscripts] bb[b[i]]++; ^ main.cpp:16:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.size(); i++) ~^~~~~~~~~ main.cpp:18:16: warning: array subscript has type 'char' [-Wchar-subscripts] aa[a[i]]++; ^ main.cpp:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<b.size(); i++) ~^~~~~~~~~ main.cpp:22:19: warning: array subscript has type 'char' [-Wchar-subscripts] if(bb[b[i]]>aa[b[i]]) ^ main.cpp:22:28: warning: array subscript has type 'char' [-Wchar-subscripts] if(bb[b[i]]>aa[b[i]]) ^ main.cpp:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.size(); i++) ~^~~~~~~~~ main.cpp:31:36: warning: array subscript has type 'char' [-Wchar-subscripts] while(!st.empty() and bb[ch] and ch<st.top() and bb[st.top()]+1<=aa[st.top()]) ^ main.cpp:36:17: warning: array subscript has type 'char' [-Wchar-subscripts] if(bb[ch]) ^ main.cpp:39:18: warning: array subscript has type 'char' [-Wchar-subscripts] bb[ch]--; ^ main.cpp:41:14: warning: array subscript has type 'char' [-Wchar-subscripts] aa[ch]--; ^