Compilare: main.cpp: In function 'long long int dfs(int, int, long long int)': main.cpp:39:37: warning: value computed is not used [-Wunused-value] 39 | dfs(n.left, depth + 1, code << 1) + dfs(n.right, depth + 1, (code << 1) + 1); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:72:23: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 72 | for (size_t i = 0; i < nr; i++) | ~~^~~~ main.cpp:95:23: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 95 | for (size_t i = 0; i < nr; i++) | ~~^~~~ main.cpp: In function 'long long int dfs(int, int, long long int)': main.cpp:39:42: warning: control reaches end of non-void function [-Wreturn-type] 39 | dfs(n.left, depth + 1, code << 1) + dfs(n.right, depth + 1, (code << 1) + 1); | ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~