answer.code:4:171: error: ‘long long int y1 [1001]’ redeclared as different kind of entity
    4 | long long T,a,b,c,d[1000001],v[1000001],o,h[1000001],fa[1000001],q,w,e,an,cn,fac[1000001],inv[1000001],st[1000001],u[1000001],bi[40],t1,t2,stt[100001],cnn,y[1001],y1[1001],sm[1100001];
      |                                                                                                                                                                           ^
In file included from /usr/include/features.h:461,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/os_defines.h:39,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/c++config.h:679,
                 from /usr/include/c++/13/cassert:43,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:33,
                 from answer.code:1:
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:221:1: note: previous declaration ‘double y1(double)’
  221 | __MATHCALL (y1,, (_Mdouble_));
      | ^~~~~~~~~~
answer.code: In function ‘void dfs(int, int)’:
answer.code:18:14: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   18 |         y1[qq]|=(1<<(ww-1));
      |              ^
answer.code:18:15: error: invalid operands of types ‘double(double) throw ()’ {aka ‘double(double)’} and ‘int’ to binary ‘operator|’
   18 |         y1[qq]|=(1<<(ww-1));
      |         ~~~~~~^~~~~~~~~~~~~
answer.code:18:15: note:   in evaluation of ‘operator|=(double(double) throw () {aka double(double)}, int)’
answer.code: In function ‘int main()’:
answer.code:126:40: warning: pointer to a function used in arithmetic [-Wpointer-arith]
  126 |                         else g2|=y1[j+1];
      |                                        ^
cc1plus: warning: pointer to a function used in arithmetic [-Wpointer-arith]
answer.code:126:32: error: invalid operands of types ‘long long int’ and ‘double (*)(double) throw ()’ {aka ‘double (*)(double)’} to binary ‘operator|’
  126 |                         else g2|=y1[j+1];
      |                              ~~^~~~~~~~~
answer.code:126:32: note:   in evaluation of ‘operator|=(long long int, double (*)(double) throw () {aka double (*)(double)})’
answer.code:32:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   32 |         scanf("%lld",&a);
      |         ~~~~~^~~~~~~~~~~
answer.code:36:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   36 |                 scanf("%lld",&d[i]);
      |                 ~~~~~^~~~~~~~~~~~~~