Compilare: main.cpp: In function 'int main()': main.cpp:39:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<s1.size(); i++) ~^~~~~~~~~~ main.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<s2.size(); i++){ ~^~~~~~~~~~ main.cpp:43:20: warning: array subscript has type 'char' [-Wchar-subscripts] if (pos[chr].empty() == true){ ^ main.cpp:47:18: warning: array subscript has type 'char' [-Wchar-subscripts] v[pos[chr].front()] = i; ^ main.cpp:48:16: warning: array subscript has type 'char' [-Wchar-subscripts] pos[chr].pop_front(); ^