Compilare: main.cpp: In function 'int main()': main.cpp:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.size(); i++) ~^~~~~~~~~ main.cpp:69:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.size(); i++) ~^~~~~~~~~ main.cpp:88:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(valid<=poz-q.size())ans+=((q.size()-1)*q.size())/2; ~~~~~^~~~~~~~~~~~~~