Compilare: main.cpp: In member function 'int MaxFlow::dfs(int, int)': main.cpp:74:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | for(int &i = ptr[node] ; i < G[node].size() ; i++) | ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:120:9: warning: unused variable 'i' [-Wunused-variable] 120 | int i , j , t; | ^ main.cpp:120:13: warning: unused variable 'j' [-Wunused-variable] 120 | int i , j , t; | ^ main.cpp:120:17: warning: unused variable 't' [-Wunused-variable] 120 | int i , j , t; | ^