Language: C++

#include<bits/stdc++.h>
#define D(x) cout<<"D:"<<#x<<'='<<x<<endl;
#define pb push_back
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
template<typename tn> inline tn next(void)
{
	tn k;
	cin>>k;
	return k;
}
template<typename tn> inline ostream& operator << (ostream& os, const vector<tn>& v)
{
	for(int i = 0; (unsigned)i < v.size(); i++) os<<v[i]<<' ';
	return os;
}
char str[30];
vector<string> ten = {"aaaaaaaaaa","aaaaaaaaab","aaaaaaaaba","aaaaaaaabb","aaaaaaaabc","aaaaaaabaa","aaaaaaabab","aaaaaaabba","aaaaaaabbb","aaaaaaabbc","aaaaaaabca","aaaaaaabcb","aaaaaaabcc","aaaaaaabcd","aaaaaabaaa","aaaaaabaab","aaaaaababa","aaaaaababb","aaaaaababc","aaaaaabbaa","aaaaaabbab","aaaaaabbba","aaaaaabbbb","aaaaaabbbc","aaaaaabbca","aaaaaabbcb","aaaaaabbcc","aaaaaabbcd","aaaaaabcaa","aaaaaabcab","aaaaaabcba","aaaaaabcbb","aaaaaabcbc","aaaaaabcca","aaaaaabccb","aaaaaabccc","aaaaaabccd","aaaaaabcda","aaaaaabcdb","aaaaaabcdc","aaaaaabcdd","aaaaaabcde","aaaaabaaaa","aaaaabaaab","aaaaabaaba","aaaaabaabb","aaaaabaabc","aaaaababaa","aaaaababab","aaaaababba","aaaaababbb","aaaaababbc","aaaaababca","aaaaababcb","aaaaababcc","aaaaababcd","aaaaabbaaa","aaaaabbaab","aaaaabbaba","aaaaabbabb","aaaaabbabc","aaaaabbbaa","aaaaabbbab","aaaaabbbba","aaaaabbbbb","aaaaabbbbc","aaaaabbbca","aaaaabbbcb","aaaaabbbcc","aaaaabbbcd","aaaaabbcaa","aaaaabbcab","aaaaabbcba","aaaaabbcbb","aaaaabbcbc","aaaaabbcca","aaaaabbccb","aaaaabbccc","aaaaabbccd","aaaaabbcda","aaaaabbcdb","aaaaabbcdc","aaaaabbcdd","aaaaabbcde","aaaaabcaaa","aaaaabcaab","aaaaabcaba","aaaaabcabb","aaaaabcabc","aaaaabcbaa","aaaaabcbab","aaaaabcbba","aaaaabcbbb","aaaaabcbbc","aaaaabcbca","aaaaabcbcb","aaaaabcbcc","aaaaabcbcd","aaaaabccaa","aaaaabccab","aaaaabccba","aaaaabccbb","aaaaabccbc","aaaaabccca","aaaaabcccb","aaaaabcccc","aaaaabcccd","aaaaabccda","aaaaabccdb","aaaaabccdc","aaaaabccdd","aaaaabccde","aaaaabcdaa","aaaaabcdab","aaaaabcdba","aaaaabcdbb","aaaaabcdbc","aaaaabcdca","aaaaabcdcb","aaaaabcdcc","aaaaabcdcd","aaaaabcdda","aaaaabcddb","aaaaabcddc","aaaaabcddd","aaaaabcdde","aaaaabcdea","aaaaabcdeb","aaaaabcdec","aaaaabcded","aaaaabcdee","aaaaabcdef","aaaabaaaaa","aaaabaaaab","aaaabaaaba","aaaabaaabb","aaaabaaabc","aaaabaabaa","aaaabaabab","aaaabaabba","aaaabaabbb","aaaabaabbc","aaaabaabca","aaaabaabcb","aaaabaabcc","aaaabaabcd","aaaababaaa","aaaababaab","aaaabababa","aaaabababb","aaaabababc","aaaababbaa","aaaababbab","aaaababbba","aaaababbbb","aaaababbbc","aaaababbca","aaaababbcb","aaaababbcc","aaaababbcd","aaaababcaa","aaaababcab","aaaababcba","aaaababcbb","aaaababcbc","aaaababcca","aaaababccb","aaaababccc","aaaababccd","aaaababcda","aaaababcdb","aaaababcdc","aaaababcdd","aaaababcde","aaaabbaaaa","aaaabbaaab","aaaabbaaba","aaaabbaabb","aaaabbaabc","aaaabbabaa","aaaabbabab","aaaabbabba","aaaabbabbb","aaaabbabbc","aaaabbabca","aaaabbabcb","aaaabbabcc","aaaabbabcd","aaaabbbaaa","aaaabbbaab","aaaabbbaba","aaaabbbabb","aaaabbbabc","aaaabbbbaa","aaaabbbbab","aaaabbbbba","aaaabbbbbb","aaaabbbbbc","aaaabbbbca","aaaabbbbcb","aaaabbbbcc","aaaabbbbcd","aaaabbbcaa","aaaabbbcab","aaaabbbcba","aaaabbbcbb","aaaabbbcbc","aaaabbbcca","aaaabbbccb","aaaabbbccc","aaaabbbccd","aaaabbbcda","aaaabbbcdb","aaaabbbcdc","aaaabbbcdd","aaaabbbcde","aaaabbcaaa","aaaabbcaab","aaaabbcaba","aaaabbcabb","aaaabbcabc","aaaabbcbaa","aaaabbcbab","aaaabbcbba","aaaabbcbbb","aaaabbcbbc","aaaabbcbca","aaaabbcbcb","aaaabbcbcc","aaaabbcbcd","aaaabbccaa","aaaabbccab","aaaabbccba","aaaabbccbb","aaaabbccbc","aaaabbccca","aaaabbcccb","aaaabbcccc","aaaabbcccd","aaaabbccda","aaaabbccdb","aaaabbccdc","aaaabbccdd","aaaabbccde","aaaabbcdaa","aaaabbcdab","aaaabbcdba","aaaabbcdbb","aaaabbcdbc","aaaabbcdca","aaaabbcdcb","aaaabbcdcc","aaaabbcdcd","aaaabbcdda","aaaabbcddb","aaaabbcddc","aaaabbcddd","aaaabbcdde","aaaabbcdea","aaaabbcdeb","aaaabbcdec","aaaabbcded","aaaabbcdee","aaaabbcdef","aaaabcaaaa","aaaabcaaab","aaaabcaaba","aaaabcaabb","aaaabcaabc","aaaabcabaa","aaaabcabab","aaaabcabba","aaaabcabbb","aaaabcabbc","aaaabcabca","aaaabcabcb","aaaabcabcc","aaaabcabcd","aaaabcbaaa","aaaabcbaab","aaaabcbaba","aaaabcbabb","aaaabcbabc","aaaabcbbaa","aaaabcbbab","aaaabcbbba","aaaabcbbbb","aaaabcbbbc","aaaabcbbca","aaaabcbbcb","aaaabcbbcc","aaaabcbbcd","aaaabcbcaa","aaaabcbcab","aaaabcbcba","aaaabcbcbb","aaaabcbcbc","aaaabcbcca","aaaabcbccb","aaaabcbccc","aaaabcbccd","aaaabcbcda","aaaabcbcdb","aaaabcbcdc","aaaabcbcdd","aaaabcbcde","aaaabccaaa","aaaabccaab","aaaabccaba","aaaabccabb","aaaabccabc","aaaabccbaa","aaaabccbab","aaaabccbba","aaaabccbbb","aaaabccbbc","aaaabccbca","aaaabccbcb","aaaabccbcc","aaaabccbcd","aaaabcccaa","aaaabcccab","aaaabcccba","aaaabcccbb","aaaabcccbc","aaaabcccca","aaaabccccb","aaaabccccc","aaaabccccd","aaaabcccda","aaaabcccdb","aaaabcccdc","aaaabcccdd","aaaabcccde","aaaabccdaa","aaaabccdab","aaaabccdba","aaaabccdbb","aaaabccdbc","aaaabccdca","aaaabccdcb","aaaabccdcc","aaaabccdcd","aaaabccdda","aaaabccddb","aaaabccddc","aaaabccddd","aaaabccdde","aaaabccdea","aaaabccdeb","aaaabccdec","aaaabccded","aaaabccdee","aaaabccdef","aaaabcdaaa","aaaabcdaab","aaaabcdaba","aaaabcdabb","aaaabcdabc","aaaabcdbaa","aaaabcdbab","aaaabcdbba","aaaabcdbbb","aaaabcdbbc","aaaabcdbca","aaaabcdbcb","aaaabcdbcc","aaaabcdbcd","aaaabcdcaa","aaaabcdcab","aaaabcdcba","aaaabcdcbb","aaaabcdcbc","aaaabcdcca","aaaabcdccb","aaaabcdccc","aaaabcdccd","aaaabcdcda","aaaabcdcdb","aaaabcdcdc","aaaabcdcdd","aaaabcdcde","aaaabcddaa","aaaabcddab","aaaabc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int main(void)
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n = next<int>();
	switch(n)
	{
		case 1:
		str[1] = '\0';
		for(str[0] = 'a'; str[0] != 'b'; str[0]++)
		printf("%s\n", str);
		break;
		case 2:
		str[2] = '\0';
		for( str[0] = 'a'; str[0] != 'b'; str[0]++)
		for( str[1] = 'a'; str[1] <= 'j' && str[1] <= str[0]+1; str[1]++)
		printf("%s\n", str);
		break;
		case 3:
		str[3] = '\0';
		for(str[0] = 'a'; str[0] != 'b'; str[0]++)
		for(str[1] = 'a'; str[1] <= 'j' && str[1] <= str[0]+1; str[1]++)
		for( str[2] = 'a'; str[2] <= 'j' && str[2] <= str[1]+1; str[2]++)
		printf("%s\n", str);
		break;
		case 4:
		str[4] = '\0';
		for( str[0] = 'a'; str[0] != 'b'; str[0]++)
		for( str[1] = 'a'; str[1] <= 'j' && str[1] <= str[0]+1; str[1]++)
		for( str[2] = 'a'; str[2] <= 'j' && str[2] <= str[1]+1; str[2]++)
		for( str[3] = 'a'; str[3] <= 'j' && str[3] <= str[2]+1; str[3]++)
		printf("%s\n", str);
		break;
		case 5:
		str[5] = '\0';
		for( str[0] = 'a'; str[0] != 'b'; str[0]++)
		for( str[1] = 'a'; str[1] <= 'j' && str[1] <= str[0]+1; str[1]++)
		for( str[2] = 'a'; str[2] <= 'j' && str[2] <= str[1]+1; str[2]++)
		for( str[3] = 'a'; str[3] <= 'j' && str[3] <= str[2]+1; str[3]++)
		for( str[4] = 'a'; str[4] <= 'j' && str[4] <= str[3]+1; str[4]++)
		printf("%s\n", str);
		break;
		case 6:
		str[6] = '\0';
		for( str[0] = 'a'; str[0] != 'b'; str[0]++)
		for( str[1] = 'a'; str[1] <= 'j' && str[1] <= str[0]+1; str[1]++)
		for( str[2] = 'a'; str[2] <= 'j' && str[2] <= str[1]+1; str[2]++)
		for( str[3] = 'a'; str[3] <= 'j' && str[3] <= str[2]+1; str[3]++)
		for( str[4] = 'a'; str[4] <= 'j' && str[4] <= str[3]+1; str[4]++)
		for( str[5] = 'a'; str[5] <= 'j' && str[5] <= str[4]+1; str[5]++)
		printf("%s\n", str);
		break;
		case 7:
		str[7] = '\0';
		for( str[0] = 'a'; str[0] != 'b'; str[0]++)
		for( str[1] = 'a'; str[1] <= 'j' && str[1] <= str[0]+1; str[1]++)
		for( str[2] = 'a'; str[2] <= 'j' && str[2] <= str[1]+1; str[2]++)
		for( str[3] = 'a'; str[3] <= 'j' && str[3] <= str[2]+1; str[3]++)
		for( str[4] = 'a'; str[4] <= 'j' && str[4] <= str[3]+1; str[4]++)
		for( str[5] = 'a'; str[5] <= 'j' && str[5] <= str[4]+1; str[5]++)
		for( str[6] = 'a'; str[6] <= 'j' && str[6] <= str[5]+1; str[6]++)
		printf("%s\n", str);
		break;
		case 8:
		str[8] = '\0';
		for( str[0] = 'a'; str[0] != 'b'; str[0]++)
		for( str[1] = 'a'; str[1] <= 'j' && str[1] <= str[0]+1; str[1]++)
		for( str[2] = 'a'; str[2] <= 'j' && str[2] <= str[1]+1; str[2]++)
		for( str[3] = 'a'; str[3] <= 'j' && str[3] <= str[2]+1; str[3]++)
		for( str[4] = 'a'; str[4] <= 'j' && str[4] <= str[3]+1; str[4]++)
		for( str[5] = 'a'; str[5] <= 'j' && str[5] <= str[4]+1; str[5]++)
		for( str[6] = 'a'; str[6] <= 'j' && str[6] <= str[5]+1; str[6]++)
		for( str[7] = 'a'; str[7] <= 'j' && str[7] <= str[6]+1; str[7]++)
		printf("%s\n", str);
		break;
		case 9:
		str[9] = '\0';
		for( str[0] = 'a'; str[0] != 'b'; str[0]++)
		for( str[1] = 'a'; str[1] <= 'j' && str[1] <= str[0]+1; str[1]++)
		for( str[2] = 'a'; str[2] <= 'j' && str[2] <= str[1]+1; str[2]++)
		for( str[3] = 'a'; str[3] <= 'j' && str[3] <= str[2]+1; str[3]++)
		for( str[4] = 'a'; str[4] <= 'j' && str[4] <= str[3]+1; str[4]++)
		for( str[5] = 'a'; str[5] <= 'j' && str[5] <= str[4]+1; str[5]++)
		for( str[6] = 'a'; str[6] <= 'j' && str[6] <= str[5]+1; str[6]++)
		for( str[7] = 'a'; str[7] <= 'j' && str[7] <= str[6]+1; str[7]++)
		for( str[8] = 'a'; str[8] <= 'j' && str[8] <= str[7]+1; str[8]++)
		printf("%s\n", str);
		break;
		case 10:
		for(int i = 0; i < ten.size(); i++) cout<<ans[i]<<endl;
		break;
	}
	return ~~(0-0);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:109:59: error: 'ans' was not declared in this scope; did you mean 'abs'?
  109 |                 for(int i = 0; i < ten.size(); i++) cout<<ans[i]<<endl;
      |                                                           ^~~
      |                                                           abs