Compilare: main.cpp: In member function 'int match::dfs(int, int)': main.cpp:44:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for (int &c = ptr[v]; c < adj[v].size(); c++) { | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:100:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 100 | for (int i = 0; i < u.size(); i++) c.insert({u[i], i}); | ~~^~~~~~~~~~ main.cpp:103:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | for (int i = 0; i < u.size(); i++) g.add_edge(i, N*(N+3)-1); | ~~^~~~~~~~~~