View Compilation Error

0_0_39305148_20059.cpp: In function 'void multi_knapsack(int, int)':
0_0_39305148_20059.cpp:14:23: error: 'j' was not declared in this scope
   14 |                 if(dp[j-v[i]])//如果 dp[j-v[i]]是可达的，则 dp[j]也可以
      |                       ^
0_0_39305148_20059.cpp:22:31: error: 'j' was not declared in this scope
   22 |                         if(dp[j-v[i]*x])//如果 dp[j-v[i]*x]是可达的，则 dp[j]也可以
      |                               ^