Compilare: main.cpp: In function 'void dfs(int)': main.cpp:26:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < L[nod].size(); i++ ){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void drum(int, int)': main.cpp:45:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < L[nod].size(); i++ ){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:65:13: warning: array subscript has type 'char' [-Wchar-subscripts] L[c1].push_back(c2); ^ main.cpp:66:16: warning: array subscript has type 'char' [-Wchar-subscripts] grad[c2]++; ^ main.cpp:75:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < sol.size(); i++ ){ ~~^~~~~~~~~~~~