Compilare: main.cpp: In function 'int sum(int, int&)': main.cpp:18:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i = 0; i < graph[node].size(); ++i) | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:55:9: warning: unused variable 'res' [-Wunused-variable] 55 | int res = sum(1, s); | ^~~