Compilare: user.cpp: In function ‘int main()’: user.cpp:54:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v.size(); i++) ^ user.cpp:55:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1; j < v.size(); j++) { ^ user.cpp:57:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0; k < h.size(); k++) { ^