View Compilation Error

0_0_26052913_2229.cpp:41:5: error: redefinition of 'int n'
 int n; double a[N],f[N];
     ^
0_0_26052913_2229.cpp:10:5: note: 'int n' previously declared here
 int n; double a[N],f[N];
     ^
0_0_26052913_2229.cpp:41:18: error: redefinition of 'double a [30]'
 int n; double a[N],f[N];
                  ^
0_0_26052913_2229.cpp:10:15: note: 'double a [30]' previously declared here
 int n; double a[N],f[N];
               ^
0_0_26052913_2229.cpp:41:23: error: redefinition of 'double f [30]'
 int n; double a[N],f[N];
                       ^
0_0_26052913_2229.cpp:10:20: note: 'double f [30]' previously declared here
 int n; double a[N],f[N];
                    ^
0_0_26052913_2229.cpp: In function 'int main()':
0_0_26052913_2229.cpp:43:5: error: redefinition of 'int main()'
 int main(){
     ^
0_0_26052913_2229.cpp:12:5: note: 'int main()' previously defined here
 int main(){
     ^