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View Compilation Error

0_0_22416620_24886.cpp:16:14: error: 'll pow [20][20]' redeclared as different kind of symbol
 ll pow[20][20];
              ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:44:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/random:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_22416620_24886.cpp:7:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:151:18: note: previous declaration 'double pow(double, double)'
   double __cdecl pow(double _X,double _Y);
                  ^
0_0_22416620_24886.cpp: In function 'll dfs(int, ll, int)':
0_0_22416620_24886.cpp:21:19: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
     if(len*pow[top][k]<sum)
                   ^
0_0_22416620_24886.cpp:41:37: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
         ret+=dfs(len-i,sum-i*pow[top][k],top-1);
                                     ^
0_0_22416620_24886.cpp: In function 'll solve(ll)':
0_0_22416620_24886.cpp:68:41: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
             ret+=sub_solve(i-1,sum-pow[j][k]);
                                         ^
0_0_22416620_24886.cpp:70:27: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
         sum=sum-pow[bit[i]][k];
                           ^
0_0_22416620_24886.cpp: In function 'int main()':
0_0_22416620_24886.cpp:83:14: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
         pow[i][0]=1;
              ^
0_0_22416620_24886.cpp:85:18: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
             pow[i][j]=i*pow[i][j-1];
                  ^
0_0_22416620_24886.cpp:85:30: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
             pow[i][j]=i*pow[i][j-1];
                              ^


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