Compilare: main.cpp: In member function 'virtual bool graph::edge_exists(int, int)': main.cpp:102:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge*>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 102 | for (int i = 0; i < vertices[start]->edges.size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'virtual bool oriented_graph::edge_exists(int, int)': main.cpp:110:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge*>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 110 | for (int i = 0; i < vertices[start]->edges.size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'virtual void graph::DFS(int, std::vector<int>&)': main.cpp:120:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge*>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 120 | for (int i = 0; i < vertices[start]->edges.size(); i++){ | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'virtual void oriented_graph::DFS(int, std::vector<int>&)': main.cpp:134:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge*>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 134 | for (int i = 0; i < vertices[start]->edges.size(); i++){ | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'virtual void graph::BFS(int)': main.cpp:170:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge*>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 170 | for (int i = 0; i < vertices[curr]->edges.size();i++) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'virtual void oriented_graph::BFS(int)': main.cpp:197:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge*>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 197 | for (int i = 0; i < vertices[curr]->edges.size();i++) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'bool oriented_graph::topo_sort()': main.cpp:221:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge*>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 221 | for (int i = 0; i < curr->edges.size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:232:32: warning: comparison of integer expressions of different signedness: 'std::vector<oriented_vertice*>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 232 | if (sorted_vertices.size() != nr_vertices) { | ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp:236:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<oriented_vertice*>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 236 | for (int i = 0; i < sorted_vertices.size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~