Compilare: user.cpp: In function ‘int main()’: user.cpp:109:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < all_edges.size(); ++ i) ^ user.cpp:116:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < tree.size(); ++ i) ^ user.cpp:139:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < init_tree.size(); ++ j) ^ user.cpp:164:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < bucket.size(); ++ j) ^ user.cpp:167:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < remaining.size(); ++ j) { ^ user.cpp:175:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < tree.size(); ++ i) ^