View Compilation Error

In file included from 0_0_29061057_556.cpp:8:0:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:15:1: error: expected initializer before 'struct'
 struct _exception;
 ^
0_0_29061057_556.cpp:9:17: error: redefinition of 'const long long int mod'
 const long long mod = 1000000007;
                 ^
0_0_29061057_556.cpp:2:21: note: 'const long long int mod' previously defined here
 const long long int mod=100000000007;
                     ^