Compilare: main.cpp: In member function 'std::vector<int> Graph::topological_sort()': main.cpp:153:26: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 153 | if(zero_nodes.size() < n) /// if there are less than n nodes in the vector then there is at least 1 cycle in the graph so it can't be sorted | ~~~~~~~~~~~~~~~~~~^~~ main.cpp: In member function 'int Graph::get_tree_diameter()': main.cpp:491:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 491 | for(auto i=1;i<viz.size();++i) | ~^~~~~~~~~~~ main.cpp: In member function 'std::vector<int> Graph::find_eulerian_cycle()': main.cpp:665:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 665 | for(auto i=0; i<edges.size(); ++i) | ~^~~~~~~~~~~~~ main.cpp: In member function 'bool Graph::bfs_HK(std::vector<int>&, std::vector<int>&, std::vector<int>&)': main.cpp:713:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 713 | for(auto i=1; i<pairU.size(); ++i) | ~^~~~~~~~~~~~~ main.cpp: In function 'void ia_solve_euler()': main.cpp:1192:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 1192 | for(auto i=0;i<cycle.size()-1 ; ++i) | ~^~~~~~~~~~~~~~~ main.cpp:1176:13: warning: unused variable 'c' [-Wunused-variable] 1176 | int a,b,c; | ^