Compilare: main.cpp: In function 'void dfs(int)': main.cpp:29:5: warning: 'if constexpr' only available with '-std=c++17' or '-std=gnu++17' 29 | if constexpr (variant == 0) | ^~~~~~~~~ In file included from /usr/include/c++/10/cassert:44, from main.cpp:1: main.cpp: In function 'int main()': main.cpp:72:11: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 72 | assert(k == n); | ~~^~~~ main.cpp:75:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 75 | for (i = 0; i != sizes.size(); ++ i) { | ~~^~~~~~~~~~~~~~~