answer.code:5:9: error: ‘vector’ does not name a type
    5 | typedef vector<double>VD;
      |         ^~~~~~
answer.code:8:1: error: ‘VD’ does not name a type
    8 | VD simplex(vector<VD>A, VD b, VD c){
      | ^~
answer.code: In function ‘int main()’:
answer.code:59:5: error: ‘VD’ was not declared in this scope
   59 |     VD c;
      |     ^~
answer.code:60:5: error: ‘vector’ was not declared in this scope
   60 |     vector<VD>A;
      |     ^~~~~~
answer.code:3:1: note: ‘std::vector’ is defined in header ‘<vector>’; did you forget to ‘#include <vector>’?
    2 | #include<algorithm>
  +++ |+#include <vector>
    3 | using namespace std;
answer.code:60:15: error: ‘A’ was not declared in this scope
   60 |     vector<VD>A;
      |               ^
answer.code:61:7: error: expected ‘;’ before ‘b’
   61 |     VD b;
      |       ^~
      |       ;
answer.code:62:24: error: ‘c’ was not declared in this scope
   62 |     for(k=1;k<=cnt;k++)c.push_back(-s[k]);
      |                        ^
answer.code:64:9: error: ‘b’ was not declared in this scope
   64 |         b.push_back(-a[i][j]);
      |         ^
answer.code:65:11: error: expected ‘;’ before ‘t’
   65 |         VD t;
      |           ^~
      |           ;
answer.code:66:28: error: ‘t’ was not declared in this scope
   66 |         for(k=1;k<=cnt;k++)t.push_back(-f[i][j][k]);
      |                            ^
answer.code:67:21: error: ‘t’ was not declared in this scope
   67 |         A.push_back(t);
      |                     ^
answer.code:69:7: error: expected ‘;’ before ‘ret’
   69 |     VD ret=simplex(A,b,c);
      |       ^~~~
      |       ;
answer.code:70:29: error: ‘ret’ was not declared in this scope
   70 |     for(i=1;i<=cnt;i++)w[i]=ret[i-1];
      |                             ^~~
answer.code:50:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   50 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
answer.code:51:44: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   51 |     for(i=1;i<=n;i++)for(j=1;j<=n;j++)scanf("%d",&a[i][j]);
      |                                       ~~~~~^~~~~~~~~~~~~~~