View Compilation Error

0_0_26472284_29732.cpp: In member function 'bool Task_sch::bfs()':
0_0_26472284_29732.cpp:41:9: error: 's' was not declared in this scope
   Width[s]=0;
         ^
0_0_26472284_29732.cpp:56:12: error: 't' was not declared in this scope
   if(Width[t]==-1)return false;
            ^
0_0_26472284_29732.cpp: In member function 'int Task_sch::dfs(int, int)':
0_0_26472284_29732.cpp:62:11: error: 't' was not declared in this scope
   if(cur==t)return dis;
           ^
0_0_26472284_29732.cpp: In member function 'bool Task_sch::Ans()':
0_0_26472284_29732.cpp:84:20: error: 's' was not declared in this scope
    while(int d=dfs(s,0x7f7f7f7f))Maxflow+=d;
                    ^