Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:58:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod].size(); ++i) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void Union(int, int)': main.cpp:48:20: warning: 'tx' is used uninitialized in this function [-Wuninitialized] int tx = find_tata(tx); ~~~~~~~~~^~~~ main.cpp:28:17: warning: 'nod' may be used uninitialized in this function [-Wmaybe-uninitialized] while (tata[nod] > 0) ~~~~~~~~^ main.cpp:47:6: note: 'nod' was declared here void Union(int x, int y) { ^~~~~ main.cpp: In function 'int main()': main.cpp:28:17: warning: 'nod' may be used uninitialized in this function [-Wmaybe-uninitialized] while (tata[nod] > 0) ~~~~~~~~^ main.cpp:47:6: note: 'nod' was declared here void Union(int x, int y) { ^~~~~