Compilare: main.cpp: In function 'void unire(int, int)': main.cpp:30:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[mic].size()>mx) mx=a[mic].size(); ~~~~~~~~~~~~~^~~ main.cpp: In function 'int main()': main.cpp:83:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[vec].size()>mx) mx=a[vec].size(); ~~~~~~~~~~~~~^~~