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View Compilation Error

0_0_14946942_6085.cpp: In function 'int main()':
0_0_14946942_6085.cpp:46:38: error: call of overloaded 'pow(int, int&)' is ambiguous
             ans += len*((pow(2, count)-1+mod)%mod)%mod*pow(2, n-count)%mod;
                                      ^
0_0_14946942_6085.cpp:46:38: note: candidates are:
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_14946942_6085.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:151:18: note: double pow(double, double)
   double __cdecl pow(double _X,double _Y);
                  ^
0_0_14946942_6085.cpp:12:4: note: ll pow(ll, ll)
 ll pow(ll a, ll b){
    ^
0_0_14946942_6085.cpp:46:70: error: call of overloaded 'pow(int, int)' is ambiguous
             ans += len*((pow(2, count)-1+mod)%mod)%mod*pow(2, n-count)%mod;
                                                                      ^
0_0_14946942_6085.cpp:46:70: note: candidates are:
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_14946942_6085.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:151:18: note: double pow(double, double)
   double __cdecl pow(double _X,double _Y);
                  ^
0_0_14946942_6085.cpp:12:4: note: ll pow(ll, ll)
 ll pow(ll a, ll b){
    ^


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