View Compilation Error

0_0_38801067_2453.cpp: In function 'void solve()':
0_0_38801067_2453.cpp:51:33: error: 'C' was not declared in this scope
   51 |                         an-=log(C[j][id]);//注意使用log优化的时候要避免0的情况,因为log0是无解的，这种0的情况要特判掉
      |                                 ^