View Compilation Error

0_0_15356410_2658.cpp: In function 'int main()':
0_0_15356410_2658.cpp:17:8: error: 'i' was not declared in this scope
   {for(i=t1-1;i<t2-1;i++)
        ^
0_0_15356410_2658.cpp:22:8: error: 'i' was not declared in this scope
    for(i=t1-1;i<t2-1;i++)
        ^
0_0_15356410_2658.cpp:26:6: error: 'i' was not declared in this scope
  for(i=0;i<N;i++)
      ^