View Compilation Error

0_0_30219117_10894.cpp: In lambda function:
0_0_30219117_10894.cpp:57:58: error: too many arguments to function 'int abs(int)'
         return t1==t2?(a.y>b.y||abs(a.x-p[0].x,b.x-p[0].x)):t1<t2;
                                                          ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/assert.h:17:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/cassert:43,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:33,
                 from 0_0_30219117_10894.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/stdlib.h:329:15: note: declared here
   int __cdecl abs(int _X);
               ^