Compilare: main.cpp: In function 'int main()': main.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) { ~~^~~~~~~~~~ main.cpp:37:25: warning: array subscript has type 'char' [-Wchar-subscripts] int t = tip[s[i]]; ^ main.cpp:38:31: warning: array subscript has type 'char' [-Wchar-subscripts] int o = orientare[s[i]]; ^ main.cpp:43:45: warning: array subscript has type 'char' [-Wchar-subscripts] if (!q.empty() && tip[s[q.top()]] == t) { ^ main.cpp:57:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) { ~~^~~~~~~~~~