View Compilation Error

0_0_21685142_3910.cpp: In function 'int main()':
0_0_21685142_3910.cpp:11:2: error: expected ';' before 'for'
  for(long long d=0;d<a;d++){
  ^
0_0_21685142_3910.cpp:11:20: error: 'd' was not declared in this scope
  for(long long d=0;d<a;d++){
                    ^