View Compilation Error

0_0_16266746_1282.cpp: In function 'int main()':
0_0_16266746_1282.cpp:19:13: error: 'n' was not declared in this scope
  for(i=1;i<=n;i++){
             ^
0_0_16266746_1282.cpp:20:7: error: 'j' was not declared in this scope
   for(j=0;j<=V;j++){
       ^
0_0_16266746_1282.cpp:22:8: error: 'vo' was not declared in this scope
     if(vo[i]<=j)
        ^
0_0_16266746_1282.cpp:23:17: error: 'val' was not declared in this scope
    dp[i][j]=max(val[i]+dp[i-1][j-vo[i]],dp[i-1][j]);
                 ^