View Compilation Error

0_0_24461661_11493.cpp: In function 'void addedge(int, int)':
0_0_24461661_11493.cpp:10:7: error: 'medge' was not declared in this scope
  edge[medge].next=head[a];
       ^
0_0_24461661_11493.cpp: In function 'bool dfe(int)':
0_0_24461661_11493.cpp:20:12: error: 'dfs' was not declared in this scope
   if(!dfs(v))
            ^
0_0_24461661_11493.cpp: In function 'void solve()':
0_0_24461661_11493.cpp:29:18: error: 'dfs' was not declared in this scope
   cnt=0;if(!dfs(i)){
                  ^
0_0_24461661_11493.cpp: In function 'int main()':
0_0_24461661_11493.cpp:60:16: error: 'iii' was not declared in this scope
    for(int j=0;iii<k;j++){
                ^