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View Compilation Error

0_0_20147247_25425.cpp:4:11: error: 'const int log' redeclared as different kind of symbol
 const int log=26;
           ^
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_20147247_25425.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:149:18: note: previous declaration 'double log(double)'
   double __cdecl log(double _X);
                  ^
0_0_20147247_25425.cpp:5:12: error: size of array 'pow' has non-integral type '<unresolved overloaded function type>'
 int pow[log];
            ^
0_0_20147247_25425.cpp:5:12: error: 'int pow [1]' redeclared as different kind of symbol
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_20147247_25425.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_20147247_25425.cpp: In function 'int main()':
0_0_20147247_25425.cpp:8:7: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
  pow[0]=1;
       ^
0_0_20147247_25425.cpp:9:16: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<'
  for(int i=1;i<log;++i)
                ^
0_0_20147247_25425.cpp:10:8: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   pow[i]=pow[i-1]<<1;
        ^
0_0_20147247_25425.cpp:10:17: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   pow[i]=pow[i-1]<<1;
                 ^
0_0_20147247_25425.cpp:21:26: error: invalid operands of types '<unresolved overloaded function type>' and 'int' to binary 'operator+'
    int k=upper_bound(pow+1,pow+log,n-2*m)-pow-1;
                          ^
0_0_20147247_25425.cpp:21:32: error: invalid operands of types '<unresolved overloaded function type>' and '<unresolved overloaded function type>' to binary 'operator+'
    int k=upper_bound(pow+1,pow+log,n-2*m)-pow-1;
                                ^
0_0_20147247_25425.cpp:22:19: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
    if(p<=2*m+pow[k])
                   ^


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