View Compilation Error

0_0_35761076_28779.cpp: In function 'int main()':
0_0_35761076_28779.cpp:21:18: error: redeclaration of 'int t'
   int t,n,i,j,ct,t;
                  ^
0_0_35761076_28779.cpp:21:7: note: 'int t' previously declared here
   int t,n,i,j,ct,t;
       ^