Compilare: main.cpp:3: warning: ignoring '#pragma gcc optimize' [-Wunknown-pragmas] 3 | #pragma gcc optimize("Ofast,unroll-loops") | main.cpp:4: warning: ignoring '#pragma gcc target' [-Wunknown-pragmas] 4 | #pragma gcc target("avx2") | main.cpp: In function 'void merge(int, int, int)': main.cpp:19:9: warning: unused variable 'i' [-Wunused-variable] 19 | int i,j; | ^ main.cpp:19:11: warning: unused variable 'j' [-Wunused-variable] 19 | int i,j; | ^ main.cpp: In function 'void dfs(int, int, int)': main.cpp:28:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for(i=0;i<adj[curr].size();i++) | ~^~~~~~~~~~~~~~~~~