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View Compilation Error

0_0_21426584_21979.cpp:5:47: error: 'long long int pow [16]' redeclared as different kind of symbol
 long long a[20000],b[20000],sum[20][20],pow[16];
                                               ^
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_21426584_21979.cpp:2:
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_21426584_21979.cpp: In function 'int main()':
0_0_21426584_21979.cpp:22:10: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
     pow[0]=1;
          ^
0_0_21426584_21979.cpp:24:14: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
         pow[i]=pow[i-1]*10;
              ^
0_0_21426584_21979.cpp:24:23: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
         pow[i]=pow[i-1]*10;
                       ^
0_0_21426584_21979.cpp:33:57: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
                 sum[i][j]=sum[i+1][j]+(s[i]-'0')*pow[j-i];
                                                         ^


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