Compilare: main.cpp: In function 'void trie_insert(trie*, char*, int, int)': main.cpp:21:9: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 21 | if(k==strlen(c)) | ~^~~~~~~~~~~ main.cpp:27:15: warning: array subscript has type 'char' [-Wchar-subscripts] 27 | if(t->fiu[ch]==0) | ^~ main.cpp:28:16: warning: array subscript has type 'char' [-Wchar-subscripts] 28 | t->fiu[ch]=new trie; | ^~ main.cpp:29:24: warning: array subscript has type 'char' [-Wchar-subscripts] 29 | trie_insert(t->fiu[ch],c,k+1,p); | ^~ main.cpp: In function 'void trie_euler(trie*, int)': main.cpp:37:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for(int i=0;i<t->val.size();i++) | ~^~~~~~~~~~~~~~