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
prakash1108: 2018-02-12 19:02:00

Done with both.....with and without stl

kuchnahiaata: 2018-02-02 18:39:38

do not use STL if you want to learn something new out of this problem

bsoni_13: 2018-02-01 07:09:51

The algorithm link posted by @shauryauppal is really nice:)

damodhar47: 2018-01-24 11:20:22

where can i find editorial solution for this problem?

starboy_jb: 2018-01-23 14:05:24

in c++
is all thing about this problem

nadstratosfer: 2018-01-14 05:42:24

mayank_soni055: http://www.spoj.com/ranks/JNEXT/lang=PYTH%203.2.3
Avinash Raj, ritwikshanker: http://www.spoj.com/ranks/JNEXT/lang=JAVA

mayank_soni055: 2018-01-13 11:49:57

Don't try in PYTHON it'll give you TLE use C/C++

Avinash Raj: 2018-01-10 06:40:07

Don't use Java you'll get TLE.

lucifer1704: 2018-01-08 12:11:21

what is the max possible number? there's info max total number possible... but nothing of max number possible.

silkypriya: 2018-01-03 20:58:35

AC in go :) Thanks to STL vector.

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