Language: C++

#include<bits/stdc++.h>
using namespace std;
int n;
int a[100001]={0,1,2,3,4,5,6,7,8,9,10,11,12,21,22,23,32,33,34,43,44,45,54,55,56,65,66,67,76,77,78,87,88,89,98,99,100,101,110,111,112,121,122,123,210,211,212,221,222,223,232,233,234,321,322,323,332,333,334,343,344,345,432,433,434,443,444,445,454,455,456,543,544,545,554,555,556,565,566,567,654,655,656,665,666,667,676,677,678,765,766,767,776,777,778,787,788,789,876,877,878,887,888,889,898,899,987,988,989,998,999,1000,1001,1010,1011,1012,1100,1101,1110,1111,1112,1121,1122,1123,1210,1211,1212,1221,1222,1223,1232,1233,1234,2100,2101,2110,2111,2112,2121,2122,2123,2210,2211,2212,2221,2222,2223,2232,2233,2234,2321,2322,2323,2332,2333,2334,2343,2344,2345,3210,3211,3212,3221,3222,3223,3232,3233,3234,3321,3322,3323,3332,3333,3334,3343,3344,3345,3432,3433,3434,3443,3444,3445,3454,3455,3456,4321,4322,4323,4332,4333,4334,4343,4344,4345,4432,4433,4434,4443,4444,4445,4454,4455,4456,4543,4544,4545,4554,4555,4556,4565,4566,4567,5432,5433,5434,5443,5444,5445,5454,5455,5456,5543,5544,5545,5554,5555,5556,5565,5566,5567,5654,5655,5656,5665,5666,5667,5676,5677,5678,6543,6544,6545,6554,6555,6556,6565,6566,6567,6654,6655,6656,6665,6666,6667,6676,6677,6678,6765,6766,6767,6776,6777,6778,6787,6788,6789,7654,7655,7656,7665,7666,7667,7676,7677,7678,7765,7766,7767,7776,7777,7778,7787,7788,7789,7876,7877,7878,7887,7888,7889,7898,7899,8765,8766,8767,8776,8777,8778,8787,8788,8789,8876,8877,8878,8887,8888,8889,8898,8899,8987,8988,8989,8998,8999,9876,9877,9878,9887,9888,9889,9898,9899,9987,9988,9989,9998,9999,10000,10001,10010,10011,10012,10100,10101,10110,10111,10112,10121,10122,10123,11000,11001,11010,11011,11012,11100,11101,11110,11111,11112,11121,11122,11123,11210,11211,11212,11221,11222,11223,11232,11233,11234,12100,12101,12110,12111,12112,12121,12122,12123,12210,12211,12212,12221,12222,12223,12232,12233,12234,12321,12322,12323,12332,12333,12334,12343,12344,12345,21000,21001,21010,21011,21012,21100,21101,21110,21111,21112,21121,21122,21123,21210,21211,21212,21221,21222,21223,21232,21233,21234,22100,22101,22110,22111,22112,22121,22122,22123,22210,22211,22212,22221,22222,22223,22232,22233,22234,22321,22322,22323,22332,22333,22334,22343,22344,22345,23210,23211,23212,23221,23222,23223,23232,23233,23234,23321,23322,23323,23332,23333,23334,23343,23344,23345,23432,23433,23434,23443,23444,23445,23454,23455,23456,32100,32101,32110,32111,32112,32121,32122,32123,32210,32211,32212,32221,32222,32223,32232,32233,32234,32321,32322,32323,32332,32333,32334,32343,32344,32345,33210,33211,33212,33221,33222,33223,33232,33233,33234,33321,33322,33323,33332,33333,33334,33343,33344,33345,33432,33433,33434,33443,33444,33445,33454,33455,33456,34321,34322,34323,34332,34333,34334,34343,34344,34345,34432,34433,34434,34443,34444,34445,34454,34455,34456,34543,34544,34545,34554,34555,34556,34565,34566,34567,43210,43211,43212,43221,43222,43223,43232,43233,43234,43321,43322,43323,43332,43333,43334,43343,43344,43345,43432,43433,43434,43443,43444,43445,43454,43455,43456,44321,44322,44323,44332,44333,44334,44343,44344,44345,44432,44433,44434,44443,44444,44445,44454,44455,44456,44543,44544,44545,44554,44555,44556,44565,44566,44567,45432,45433,45434,45443,45444,45445,45454,45455,45456,45543,45544,45545,45554,45555,45556,45565,45566,45567,45654,45655,45656,45665,45666,45667,45676,45677,45678,54321,54322,54323,54332,54333,54334,54343,54344,54345,54432,54433,54434,54443,54444,54445,54454,54455,54456,54543,54544,54545,54554,54555,54556,54565,54566,54567,55432,55433,55434,55443,55444,55445,55454,55455,55456,55543,55544,55545,55554,55555,55556,55565,55566,55567,55654,55655,55656,55665,55666,55667,55676,55677,55678,56543,56544,56545,56554,56555,56556,56565,56566,56567,56654,56655,56656,56665,56666,56667,56676,56677,56678,56765,56766,56767,56776,56777,56778,56787,56788,56789,65432,65433,65434,65443,65444,65445,65454,65455,65456,65543,65544,65545,65554,65555,65556,65565,65566,65567,65654,65655,65656,65665,65666,65667,65676,65677,65678,66543,66544,66545,66554,66555,66556,66565,66566,66567,66654,66655,66656,66665,66666,66667,66676,66677,66678,66765,66766,66767,66776,66777,66778,66787,66788,66789,67654,67655,67656,67665,67666,67667,67676,67677,67678,67765,67766,67767,67776,67777,67778,67787,67788,67789,67876,67877,67878,67887,67888,67889,67898,67899,76543,76544,76545,76554,76555,76556,76565,76566,76567,76654,76655,76656,76665,76666,76667,76676,76677,76678,76765,76766,76767,76776,76777,76778,76787,76788,76789,77654,77655,77656,77665,77666,77667,77676,77677,77678,77765,77766,77767,77776,77777,77778,77787,77788,77789,77876,77877,77878,77887,77888,77889,77898,77899,78765,78766,78767,78776,78777,78778,78787,78788,78789,78876,78877,78878,78887,78888,78889,78898,78899,78987,78988,78989,78998,78999,87654,87655,87656,87665,87666,87667,87676,87677,87678,87765,87766,87767,87776,87777,87778,87787,87788,87789,87876,87877,87878,87887,87888,87889,87898,87899,88765,88766,88767,88776,88777,88778,88787,88788,88789,88876,88877,88878,88887,88888,88889,88898,88899,88987,88988,88989,88998,88999,89876,89877,89878,89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{
	cin>>n;
	cout<<a[i];
}


Compiler output:
a.cc:5:1: error: expected unqualified-id before '{' token
    5 | {
      | ^