Compilare: main.cpp: In function 'int main()': main.cpp:20:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i<a.size(); i++) ~^~~~~~~~~ main.cpp:35:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = n+1; i<a.size() && nr > 0; i++) ~^~~~~~~~~