View Compilation Error

0_0_29754293_13020.cpp: In function 'void tarjan(int)':
0_0_29754293_13020.cpp:95:12: error: 'k' was not declared in this scope
   if (!dfn[k]) {
            ^
0_0_29754293_13020.cpp:101:35: error: 'i' was not declared in this scope
     qzcut[k] = min(qzcut[k], edge[i].qz);
                                   ^
0_0_29754293_13020.cpp: At global scope:
0_0_29754293_13020.cpp:108:2: error: expected unqualified-id before 'if'
  if (dfn[x] == low[x]) {
  ^