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View Compilation Error

0_0_30236968_9508.cpp: In function 'int main()':
0_0_30236968_9508.cpp:52:40: error: call of overloaded 'sqrt(__int128&)' is ambiguous
         for(__int128 i=(__int128)sqrt(n);i>=1;i--) if(i*i*i<=n&&(i+1)*(i+1)*(i+1)>n){r=i;break;}
                                        ^
0_0_30236968_9508.cpp:52:40: 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++/x86_64-w64-mingw32/bits/stdc++.h:41,
                 from 0_0_30236968_9508.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:152:18: note: double sqrt(double)
   double __cdecl sqrt(double _X);
                  ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:41:0,
                 from 0_0_30236968_9508.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:486:3: note: constexpr long double std::sqrt(long double)
   sqrt(long double __x)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:482:3: note: constexpr float std::sqrt(float)
   sqrt(float __x)
   ^


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