/in/foo.cc: In function 'int main()':
/in/foo.cc:4:22: error: 'n' was not declared in this scope
  while(scanf("%d%d",&n,&e)!=EOF){
                      ^
/in/foo.cc:4:25: error: 'e' was not declared in this scope
  while(scanf("%d%d",&n,&e)!=EOF){
                         ^