foo.cc: In function 'int main()':
foo.cc:25:14: error: 'i' does not name a type
     register i,j;
              ^
foo.cc:27:6: error: 'i' was not declared in this scope
  for(i=1;i<=N;i++)
      ^
foo.cc:31:6: error: 'i' was not declared in this scope
  for(i=1;i<=N;i++)
      ^
foo.cc:33:6: error: 'i' was not declared in this scope
  for(i=1;i<=N;i++){
      ^
foo.cc:34:7: error: 'j' was not declared in this scope
   for(j=ma[i-1];j>=0;j--){
       ^
foo.cc:41:6: error: 'i' was not declared in this scope
  for(i=ma[N];i;i--){
      ^

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