JNEXT - Just Next !!!

DevG likes too much fun to do with numbers. Once his friend Arya came and gave him a challenge, he gave DevG an array of digits which is forming a number currently (will be called as given number). DevG was challanged to find the just next greater number which can be formed using digits of given number. Now DevG needs your help to find that just next greater number and win the challenge.


The first line have t number of test cases (1 <= t <= 100). In next 2*t lines for each test case first there is number n (1 <= n <= 1000000) which denotes the number of digits in given number and next line contains n digits of given number separated by space.


Print the just next greater number if possible else print -1 in one line for each test case.

Note : There will be no test case which contains zero in starting digits of any given number.


1 5 4 8 3
1 4 7 4 5 8 4 1 2 6


hide comments
bhavi736: 2017-11-13 11:18:44

Last edit: 2017-11-13 11:50:03
bir1997: 2017-10-25 16:40:32

no need of any stl or any special fns!!

shauryauppal: 2017-10-05 19:16:58


How next_permutation works one must know? This helped a lot the diagram explanation.

vivaangupta: 2017-10-04 17:43:01


saurav52: 2017-08-26 21:58:49

Did without STL :)

laxman2405: 2017-07-26 14:27:16

Dont forget the case of -1. Costed me 1WA

cake_is_a_lie: 2017-03-02 06:37:20

int I/O 0.13; char I/O 0.02

loverboy: 2016-12-31 06:13:21

did without STL and with STL next_permutation().

scorpion_ajay: 2016-12-19 08:28:42

answer will be -1 for cases like : 5 4 3 2 1
its next largest number is not possible if same digits are to be used :)

michaelscof: 2016-11-10 11:50:02

throw some light on cases where ans would be -1?spojtoolkit cant help me.. :(

Added by:! include(L.ppt)
Time limit:1.297s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ASM64
Resource:MNNIT OPC 31-08-2012