Compilare: user.cpp: In function ‘int main()’: user.cpp:53:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p + 1 < D[dest].size()) { ^ user.cpp:60:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (q < D[dest].size() && D[dest][p].second < D[dest][q].second) { ^ user.cpp:67:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int t = p + 1; t + (q - p) < D[dest].size(); ++t) { ^