Compilare: main.cpp: In function 'int main()': main.cpp:30:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j<n1){ ~^~~ main.cpp:45:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < n2){ ~~^~~~ main.cpp:48:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (lun == n1){ ~~~~^~~~~