Compilare: main.cpp: In function 'int main()': main.cpp:37:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int f = 0 ; f < v.size() ; f ++) ~~^~~~~~~~~~ main.cpp:38:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int e = f + 1 ; e < v.size() ; e ++) ~~^~~~~~~~~~ main.cpp:61:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int f = 1 ; f < vv.size() ; f ++) ~~^~~~~~~~~~~