Compilare: main.cpp: In function 'void add(Node*&, char*, int)': main.cpp:13:12: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 13 | if(pos == strlen(s)){ | ~~~~^~~~~~~~~~~~ main.cpp: In function 'int del(Node*&, char*, int)': main.cpp:25:12: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 25 | if(pos == strlen(s)){ | ~~~~^~~~~~~~~~~~ main.cpp: In function 'int queryap(const Node*, char*, int)': main.cpp:46:12: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 46 | if(pos == strlen(s)) | ~~~~^~~~~~~~~~~~ main.cpp: In function 'int prefix(const Node*, char*, int)': main.cpp:54:53: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 54 | if(trie ->children[s[pos] - 'a'] == NULL || pos == strlen(s)) | ~~~~^~~~~~~~~~~~