View Compilation Error

0_0_36712987_19220.cpp:86:7: error: redefinition of 'int n'
 int T,n;
       ^
0_0_36712987_19220.cpp:12:11: note: 'int n' previously declared here
 int f[mn],n;
           ^
0_0_36712987_19220.cpp: In function 'int main()':
0_0_36712987_19220.cpp:87:5: error: redefinition of 'int main()'
 int main() {
     ^
0_0_36712987_19220.cpp:32:5: note: 'int main()' previously defined here
 int main() {
     ^