foo.cc:29:11: error: redefinition of 'const int maxn'
   29 | const int maxn = 2010;
      |           ^~~~
foo.cc:5:11: note: 'const int maxn' previously defined here
    5 | const int maxn = 2010;
      |           ^~~~
foo.cc:30:5: error: redefinition of 'int dp [2010][2010]'
   30 | int dp[maxn][maxn];
      |     ^~
foo.cc:6:5: note: 'int dp [2010][2010]' previously declared here
    6 | int dp[maxn][maxn];
      |     ^~
foo.cc:32:5: error: redefinition of 'int main()'
   32 | int main() {
      |     ^~~~
foo.cc:8:5: note: 'int main()' previously defined here
    8 | int main() {
      |     ^~~~

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