View Compilation Error

0_0_21057691_1735.cpp: In function 'int main()':
0_0_21057691_1735.cpp:12:21: error: redeclaration of 'long long int k'
         long long n,k,f=0;
                     ^
0_0_21057691_1735.cpp:10:13: note: 'int k' previously declared here
     for(int k=1;k<=t;k++){
             ^