View Compilation Error

0_0_24662925_21939.cpp: In function 'void add_edge(int, int)':
0_0_24662925_21939.cpp:22:5: error: 'nxt' was not declared in this scope
     nxt[e]=fir[s];
     ^
0_0_24662925_21939.cpp: In function 'void update(int, int)':
0_0_24662925_21939.cpp:29:19: error: invalid conversion from 'int (*)(int)' to 'int' [-fpermissive]
     for(;x<=maxn;x+=lowbit)c[x]+=val;
                   ^
0_0_24662925_21939.cpp: In function 'void dfs1(int, int, int)':
0_0_24662925_21939.cpp:44:45: error: expected ']' before ')' token
             if(son[k]==-1||siz[e]>siz[son[k])son[k]=e;
                                             ^
0_0_24662925_21939.cpp: In function 'void dfs2(int, int)':
0_0_24662925_21939.cpp:56:27: error: 'dfss' was not declared in this scope
             dfss(v[i],v[i]);
                           ^