View Compilation Error

0_0_4487833_22195.cpp: In function `void dfs(int)':
0_0_4487833_22195.cpp:57: error: call of overloaded `abs(long long int)' is ambiguous
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/stdlib.h:363: note: candidates are: int abs(int)
0_0_4487833_22195.cpp:46: note:                 long long int abs(long long int)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cstdlib:153: note:                 long long int __gnu_cxx::abs(long long int)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cstdlib:123: note:                 long int std::abs(long int)