Compilare: main.cpp: In function 'int main()': main.cpp:21:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; ++i) ~~^~~~ main.cpp:27:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; ++i) ~~^~~~ main.cpp:29:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j < sol[i]; ++j) ~~^~~~~~~~