View Compilation Error

0_0_30548341_30692.cpp: In function 'void work()':
0_0_30548341_30692.cpp:104:49: error: call of overloaded 'abs(double)' is ambiguous
             mx = max(abs(dp[now][i] - dp[pre][i]), mx);
                                                 ^
0_0_30548341_30692.cpp:104:49: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:72:0,
                 from 0_0_30548341_30692.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/stdlib.h:329:15: note: int abs(int)
   int __cdecl abs(int _X);
               ^
In file included from 0_0_30548341_30692.cpp:4:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:174:3: note: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:166:3: note: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^