#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
using?namespace?std;
int?main（）
{
????freopen（“date.in““r“stdin）;
????freopen（“date.out““w“stdout）;
????int?t;
????scanf（“%d“&t）;
????while（t--）
????{
????????int?abcd;
????????scanf（“%d%d%d%d“&a&b&c&d）;
????????if（c==d&&c==0&&a!=0&&b!=0）
????????{
????????????printf（“-1\n“）;
????????????continue;
????????}
????????if（abs（c-d）>1）
????????{
????????????printf（“-1\n“）;
????????????continue;
????????}
????????if（a==b&&b==c&&c==d）
????????{
????????????printf（“-1\n“）;
????????????continue;
????????}
????????if（a????????{
????????????printf（“-1\n“）;
????????????continue;
????????}
????????if（c>d）
????????{
????????????a-=c;
????????????b-=c;
????????????while（a--）?printf（“a“）;
????????????while（c--）?printf（“ab“）;
????????????while（b--）?printf（“b“）;
????????????printf（“\n“）;
????????????continue;
????????}
????????if（c????????{
????????????if（d==1）
????????????{
????????????????while（b--）?printf（“b“）;
????????????????while（a--）?printf（“a“）;
????????????????printf（“\n“）;
????????????????continue;
????????????}
????????????a-=d;
????????????b-=d;
????????????printf（“ba“）;
????????????d--;
????????????while（a--）?printf（“a“）;
????????????d--;
????????????while（d--）?printf（“ba“）;
????????????while（b--）?printf（“b“）;
????????????printf（“ba\n“）;
????????????continue;
????????}
????????if（c==d）
????????{
????????????if（a==c）
????????????{
????????????????b-=c;
????????????????while（c--）?printf（“ba“）;
????????????????while（b--）?printf（“b“）;
????????????????printf（“\n“）;
????????????????continue;
????????????}
????????????a-=c;
????????????b-=c;
????????????a--;
????????????while（a--）?printf（“a“）;
????????????while（c--）?printf（“ab“）;
????????????while（b--）?printf（“b“）;
????????????printf（“a\n“）;
????????}
????}
}

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件?????792803??2016-05-08?17:38??校賽題目2.6.pdf

?????文件???????2000??2016-04-30?13:01??標(biāo)程\A.cpp

?????文件???????1132??2016-05-07?21:12??標(biāo)程\B.cpp

?????文件????????572??2016-04-30?12:14??標(biāo)程\C.cpp

?????文件????????365??2016-04-30?13:21??標(biāo)程\D.cpp

?????文件????????888??2016-04-30?12:45??標(biāo)程\E.cpp

?????文件???????1832??2016-04-30?12:56??標(biāo)程\F.cpp

?????文件????????723??2016-04-26?16:55??標(biāo)程\G.cpp

?????文件???????1400??2016-04-26?15:53??標(biāo)程\H.cpp

?????文件???????2119??2016-04-26?17:16??標(biāo)程\I.cpp

?????文件???????4700??2016-04-28?23:37??標(biāo)程\J.cpp

?????文件????????611??2016-04-30?13:03??數(shù)據(jù)\A.in

?????文件????3301496??2016-04-30?13:03??數(shù)據(jù)\A.out

?????文件????????106??2016-04-30?13:05??數(shù)據(jù)\B.in

?????文件????????112??2016-04-30?13:05??數(shù)據(jù)\B.out

?????文件????????788??2016-04-30?12:58??數(shù)據(jù)\C.in

?????文件???????1081??2016-04-30?12:58??數(shù)據(jù)\C.out

?????文件??????36592??2016-04-30?13:19??數(shù)據(jù)\D.in

?????文件??????19154??2016-04-30?13:19??數(shù)據(jù)\D.out

?????文件??????50847??2016-05-08?17:35??數(shù)據(jù)\E.in

?????文件???????9131??2016-05-08?17:35??數(shù)據(jù)\E.out

?????文件????5652599??2016-04-30?12:56??數(shù)據(jù)\F.in

?????文件????????154??2016-04-30?12:56??數(shù)據(jù)\F.out

?????文件?????106277??2016-04-26?16:54??數(shù)據(jù)\G.in

?????文件????????544??2016-04-26?16:11??數(shù)據(jù)\G.out

?????文件????3575980??2016-04-26?15:34??數(shù)據(jù)\H.in

?????文件????????543??2016-04-26?15:53??數(shù)據(jù)\H.out

?????文件??????18988??2016-04-30?15:48??數(shù)據(jù)\I.in

?????文件????????520??2016-04-30?15:48??數(shù)據(jù)\I.out

?????文件????3232347??2016-04-28?23:28??數(shù)據(jù)\J.in

............此處省略6個(gè)文件信息