View Compilation Error

0_0_15504185_20652.cpp: In function 'void dfs(int, int)':
0_0_15504185_20652.cpp:29:37: error: 'cnt' was not declared in this scope
  if(wan[px][py]!=-1 && wan[px][py]<=cnt)return;
                                     ^
0_0_15504185_20652.cpp:30:16: error: 'cnt' was not declared in this scope
  wan[px][py] = cnt;
                ^
0_0_15504185_20652.cpp: In function 'int main(int, char**)':
0_0_15504185_20652.cpp:80:27: error: expected primary-expression before '^' token
    sx--; sy--; ax--; ay--;^
                           ^