View Compilation Error

0_0_29392685_31400.cpp: In function 'int dfs(int, int)':
0_0_29392685_31400.cpp:70:15: error: 's' was not declared in this scope
     for(int i=s[u];~i;i=edge[i].nt)
               ^
0_0_29392685_31400.cpp:70:25: error: 'edge' was not declared in this scope
     for(int i=s[u];~i;i=edge[i].nt)
                         ^
0_0_29392685_31400.cpp:75:9: error: 'maxlen' was not declared in this scope
         maxlen=max(maxlen,tmp+d);
         ^