View Compilation Error

1_866_561_2668.cpp:43:11: error: redefinition of 'const int maxn'
 const int maxn=1e5+7;
           ^
1_866_561_2668.cpp:7:11: note: 'const int maxn' previously defined here
 const int maxn=1e5+7;
           ^
1_866_561_2668.cpp:44:11: error: redefinition of 'const int mod'
 const int mod=1e9+7;
           ^
1_866_561_2668.cpp:8:11: note: 'const int mod' previously defined here
 const int mod=1e9+7;
           ^
1_866_561_2668.cpp:45:14: error: redefinition of 'const double pi'
 const double pi=acos(-1.0);
              ^
1_866_561_2668.cpp:9:14: note: 'const double pi' previously defined here
 const double pi=acos(-1.0);
              ^
1_866_561_2668.cpp: In function 'int main()':
1_866_561_2668.cpp:47:8: error: redefinition of 'int main()'
 signed main()
        ^
1_866_561_2668.cpp:11:8: note: 'int main()' previously defined here
 signed main()
        ^