View Compilation Error

0_0_18456913_25868.cpp: In function 'int main()':
0_0_18456913_25868.cpp:28:13: error: redeclaration of 'int t'
         int t = 1;
             ^
0_0_18456913_25868.cpp:16:13: note: 'int t' previously declared here
     for(int t=1; t<=_t; t++)
             ^