View Compilation Error

0_0_37047101_6254.cpp: In function 'int main()':
0_0_37047101_6254.cpp:11:12: error: redeclaration of 'int n'
  int i, j, n, m, k, a[N], b;
            ^
0_0_37047101_6254.cpp:9:6: note: 'int n' previously declared here
  int n;
      ^