View Compilation Error

0_0_17693655_17955.cpp:72:14: error: redefinition of 'int n'
 int dp[maxn],n;
              ^
0_0_17693655_17955.cpp:13:5: note: 'int n' previously declared here
 int n, pos[N];
     ^
0_0_17693655_17955.cpp: In function 'int main()':
0_0_17693655_17955.cpp:106:14: error: too many arguments to function 'void cdq(int, int)'
   cdq(1, n, n);
              ^
0_0_17693655_17955.cpp:75:6: note: declared here
 void cdq(int l, int r)//算出内部的贡献
      ^