Compilare: main.cpp: In function 'void brute_force()': main.cpp:14:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++)hm[v[i]]=0; ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:90:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ~^~~~~~~~~ main.cpp:100:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v.size();j++) ~^~~~~~~~~