Compilare: main.cpp: In function 'int main()': main.cpp:34:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size()-2; i++) ~^~~~~~~~~~~ main.cpp:35:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1; j<v.size()-1; j++) ~^~~~~~~~~~~