foo.cc: In function 'int main()':
foo.cc:22:12: error: 'w' was not declared in this scope
   22 |    if(j >= w[i])
      |            ^
foo.cc:23:48: error: 'val' was not declared in this scope
   23 |                 dp[i][j] = max(dp[i-1][j-w[i]]+val[i], dp[i-1][j]);
      |                                                ^~~

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