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View Compilation Error

0_0_36622292_22604.cpp:15:9: error: conflicting declaration 'int a [20]'
 int a[20],b[20];
         ^
0_0_36622292_22604.cpp:14:6: note: previous declaration as 'll a [12]'
 ll x,a[12];
      ^
0_0_36622292_22604.cpp: In function 'void dfs1(int, int, ll)':
0_0_36622292_22604.cpp:27:26: error: 'dfs2' was not declared in this scope
   dfs2(s1^i,s2,x*f[i]%mod);
                          ^
0_0_36622292_22604.cpp: In function 'int main()':
0_0_36622292_22604.cpp:51:18: error: 'c1' was not declared in this scope
    if(op=='*') a[c1++]=t;
                  ^
0_0_36622292_22604.cpp:52:11: error: 'c2' was not declared in this scope
    else b[c2++]=t;
           ^
0_0_36622292_22604.cpp:54:20: error: 'c1' was not declared in this scope
   for(int i=0;i<1<<c1;i++){
                    ^
0_0_36622292_22604.cpp:59:20: error: 'c2' was not declared in this scope
   for(int i=0;i<1<<c2;i++){
                    ^
0_0_36622292_22604.cpp:65:12: error: 'c1' was not declared in this scope
   dfs1((1<<c1)-1,(1<<c2)-1,x);
            ^
0_0_36622292_22604.cpp:65:22: error: 'c2' was not declared in this scope
   dfs1((1<<c1)-1,(1<<c2)-1,x);
                      ^


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