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:134:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < init_tree.size(); ++ j) ^ user.cpp:170:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < tree.size(); ++ i) ^ user.cpp:172:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < remaining.size(); ++ i) ^ user.cpp:143:13: warning: unused variable ‘bonus’ [-Wunused-variable] int bonus; ^