View Compilation Error

0_0_37321480_8419.cpp: In member function 'bool Dinic::bfs()':
0_0_37321480_8419.cpp:45:28: error: 'n' was not declared in this scope
                  if(ver == n) return true;
                            ^
0_0_37321480_8419.cpp: In member function 'll Dinic::dfs(int, ll)':
0_0_37321480_8419.cpp:54:14: error: 'n' was not declared in this scope
      if(u == n) return limit;
              ^
0_0_37321480_8419.cpp: In member function 'void SP::spfa()':
0_0_37321480_8419.cpp:97:22: error: 'n' was not declared in this scope
   for(int i = 0; i < n + 100; i ++) d[i] = inf;
                      ^