highway.cpp: In function 'void initdfs(int, int)':
highway.cpp:21:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
21 | for(auto [v,edge] : g[u])
| ^
highway.cpp: In function 'int onpath(int, int)':
highway.cpp:36:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
36 | for(auto [v,edge]:g[u])
| ^
highway.cpp:44:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
44 | for(auto [v,edge]:g[u])
| ^
highway.cpp: In function 'void markdfs(int, bool)':
highway.cpp:59:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
59 | for(auto [v,edge]:g[u])
| ^
highway.cpp: In function 'void leavesdfs(int)':
highway.cpp:67:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
67 | for(auto [v,edge]:g[u])
| ^
highway.cpp: In function 'int rec(int, int, int)':
highway.cpp:107:9: error: 'ncost' was not declared in this scope; did you mean 'cost'?
107 | if((ncost-cost)/b==edges)return rec(l,mid,cnt);
| ^~~~~
| cost
highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:165:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
165 | for(int i=0;i<g[root].size();i++)
| ~^~~~~~~~~~~~~~~
highway.cpp:171:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
171 | for(int i=0;i<g[root].size();i++)
| ~^~~~~~~~~~~~~~~