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View Compilation Error

0_0_14968154_32174.cpp:12:12: error: 'LL pow [35]' redeclared as different kind of symbol
 LL pow[MAXN];
            ^
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_14968154_32174.cpp:3:
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_14968154_32174.cpp: In function 'void Pre()':
0_0_14968154_32174.cpp:16:10: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
     pow[0] = 1;
          ^
0_0_14968154_32174.cpp:18:14: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
         pow[i] = 2 * pow[i-1];
              ^
0_0_14968154_32174.cpp:18:29: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
         pow[i] = 2 * pow[i-1];
                             ^
0_0_14968154_32174.cpp: In function 'int main()':
0_0_14968154_32174.cpp:75:32: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
             ans += a[i] * pow[i];
                                ^


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