Compilare: main.cpp: In member function 'void trienod::add()': main.cpp:18:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(depth==s.size()) return; ~~~~~^~~~~~~~~~ main.cpp:20:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(depth+1==s.size()) x=0; ~~~~~~~^~~~~~~~~~ main.cpp:22:9: warning: array subscript has type 'char' [-Wchar-subscripts] if(v[x]==nullptr) v[x]=new trienod(depth+1); ^ main.cpp:22:24: warning: array subscript has type 'char' [-Wchar-subscripts] if(v[x]==nullptr) v[x]=new trienod(depth+1); ^ main.cpp:23:6: warning: array subscript has type 'char' [-Wchar-subscripts] v[x]->add(); ^ main.cpp: In member function 'bool trienod::del()': main.cpp:27:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(depth==s.size()) return !cnt; ~~~~~^~~~~~~~~~ main.cpp:29:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(depth+1==s.size()) x=0; ~~~~~~~^~~~~~~~~~ main.cpp:31:9: warning: array subscript has type 'char' [-Wchar-subscripts] if(v[x]->del()){ ^ main.cpp:32:14: warning: array subscript has type 'char' [-Wchar-subscripts] delete v[x]; ^ main.cpp:33:7: warning: array subscript has type 'char' [-Wchar-subscripts] v[x]=nullptr; ^ main.cpp: In member function 'int trienod::srcf()': main.cpp:38:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(depth==s.size()) return cnt; ~~~~~^~~~~~~~~~ main.cpp:40:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(depth+1==s.size()) x=0; ~~~~~~~^~~~~~~~~~ main.cpp:42:9: warning: array subscript has type 'char' [-Wchar-subscripts] if(v[x]==nullptr) return 0; ^ main.cpp:43:13: warning: array subscript has type 'char' [-Wchar-subscripts] return v[x]->srcf(); ^ main.cpp: In member function 'int trienod::srcp()': main.cpp:46:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(depth+1==s.size()) return depth; ~~~~~~~^~~~~~~~~~ main.cpp:48:9: warning: array subscript has type 'char' [-Wchar-subscripts]