View Compilation Error

0_0_37622421_6464.cpp: In function 'void solve()':
0_0_37622421_6464.cpp:72:6: error: 'RI' was not declared in this scope
  for(RI i=0;i<limit;i++) a[i].x=a[i].y=b[i].x=b[i].y=0;
      ^
0_0_37622421_6464.cpp:72:13: error: 'i' was not declared in this scope
  for(RI i=0;i<limit;i++) a[i].x=a[i].y=b[i].x=b[i].y=0;
             ^