Compilare: main.cpp: In function 'void add_edge(int, int, int)': main.cpp:20:36: warning: narrowing conversion of '(& v.std::vector<std::vector<edges> >::operator[](((std::vector<std::vector<edges> >::size_type)b)))->std::vector<edges>::size()' from 'std::vector<edges>::size_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing] 20 | v[a].push_back({b,1,0,v[b].size()}); | ~~~~~~~~~^~ main.cpp:21:38: warning: narrowing conversion of '((& v.std::vector<std::vector<edges> >::operator[](((std::vector<std::vector<edges> >::size_type)a)))->std::vector<edges>::size() - 1)' from 'std::vector<edges>::size_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing] 21 | v[b].push_back({a,0,0,v[a].size()-1}); | ~~~~~~~~~~~^~ main.cpp: In function 'bool bfs(int, int)': main.cpp:33:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edges>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for(int i = 0; i<v[nod].size();i++) | ~^~~~~~~~~~~~~~ main.cpp: In function 'int dfs(int, int, int)': main.cpp:50:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edges>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for(int &i = ptr[nod]; i<v[nod].size(); i++) | ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:93:22: warning: suggest parentheses around assignment used as truth value [-Wparentheses] 93 | while(pushed = dfs(0,t,1e7)) | ~~~~~~~^~~~~~~~~~~~~~ main.cpp:105:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edges>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 105 | for(int j = 0; j<v[i].size(); j++) | ~^~~~~~~~~~~~