View Compilation Error

0_0_17035476_19547.cpp:24:38: error: expected unqualified-id before numeric constant
 const LL INF = 777777777444444444LL; 18
                                      ^
0_0_17035476_19547.cpp: In function 'void dfs(long long int, int, int)':
0_0_17035476_19547.cpp:29:17: error: 'a' was not declared in this scope
     if (x == y) a[++an] = now;
                 ^
0_0_17035476_19547.cpp: In function 'int main()':
0_0_17035476_19547.cpp:37:11: error: 'a' was not declared in this scope
     sort (a + 1, a + 1 + an);
           ^
0_0_17035476_19547.cpp:48:9: error: expected ';' before '}' token
         } else {
         ^