Compilare: main.cpp: In function 'void build(Node*&)': main.cpp:35:13: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 35 | if (ind == strlen (s)) | ~~~~^~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:88:27: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 88 | for(int i = 0 ; i < strlen (s) ; ++ i) | ~~^~~~~~~~~~~~