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#include <bits/stdc++.h>
#define ll long long 
#define all(v) v.begin(),v.end()
#define endl '\n'
#define PI acos(-1)
using namespace std;
void fast()
{
    std::ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}
 
ll frea[27], freb[27];
 
int main()
{
    fast();
    int tt; cin >> tt;
    while (tt--)
    {
        memset(frea, 0, sizeof frea);
        memset(freb, 0, sizeof freb);
        bool p = true;
        ll n, k; cin >> n >> k;
        string a, b; cin >> a >> b;
        for (auto i : a)
            frea[i - 'a']++;
        for (auto i : b)
            freb[i - 'a']++;
        for (int i = 0; i < 26; i++)
       {
            ll m = min(frea[i], freb[i]);
            frea[i] -= m;
            freb[i] -= m;
        }
        for (int i = 0; i < 26; i++)
        {
            if (!(freb[i] % k)) {
                for (int j = 0; j < i; j++)
                {
                    if (frea[j] >= k)
                    {
                        ll m = min(freb[i], frea[j]);
                        frea[j] -= m;
                        freb[i] -= m;
                    }
                    if (!freb[i])
                        break;
                }
            }
            else {
                p = false;
                break;
            }
        }
 
        for(int i=0;i<26;i++)
            if (frea[i] != freb[i])
            {
                p = false;
                break;
            }
 
        if (p)
            cout << "YES" << endl;
        else
            cout << "NO" << endl;
    }
    return 0;
}

Main.java:1: error: illegal character: '#'
#include <bits/stdc++.h>
^
Main.java:1: error: class, interface, or enum expected
#include <bits/stdc++.h>
         ^
Main.java:2: error: illegal character: '#'
#define ll long long 
^
Main.java:3: error: illegal character: '#'
#define all(v) v.begin(),v.end()
^
Main.java:4: error: illegal character: '#'
#define endl '\n'
^
Main.java:5: error: illegal character: '#'
#define PI acos(-1)
^
Main.java:7: error: class, interface, or enum expected
void fast()
^
Main.java:10: error: class, interface, or enum expected
    cin.tie(0);
    ^
Main.java:11: error: class, interface, or enum expected
    cout.tie(0);
    ^
Main.java:12: error: class, interface, or enum expected
}
^
Main.java:16: error: class, interface, or enum expected
int main()
^
Main.java:19: error: class, interface, or enum expected
    int tt; cin >> tt;
    ^
Main.java:19: error: class, interface, or enum expected
    int tt; cin >> tt;
            ^
Main.java:20: error: class, interface, or enum expected
    while (tt--)
    ^
Main.java:23: error: class, interface, or enum expected
        memset(freb, 0, sizeof freb);
        ^
Main.java:24: error: class, interface, or enum expected
        bool p = true;
        ^
Main.java:25: error: class, interface, or enum expected
        ll n, k; cin >> n >> k;
        ^
Main.java:25: error: class, interface, or enum expected
        ll n, k; cin >> n >> k;
                 ^
Main.java:26: error: class, interface, or enum expected
        string a, b; cin >> a >> b;
        ^
Main.java:26: error: class, interface, or enum expected
        string a, b; cin >> a >> b;
                     ^
Main.java:27: error: class, interface, or enum expected
        for (auto i : a)
        ^
Main.java:29: error: class, interface, or enum expected
        for (auto i : b)
        ^
Main.java:31: error: class, interface, or enum expected
        for (int i = 0; i < 26; i++)
        ^
Main.java:31: error: class, interface, or enum expected
        for (int i = 0; i < 26; i++)
                        ^
Main.java:31: error: class, interface, or enum expected
        for (int i = 0; i < 26; i++)
                                ^
Main.java:34: error: class, interface, or enum expected
            frea[i] -= m;
            ^
Main.java:35: error: class, interface, or enum expected
            freb[i] -= m;
            ^
Main.java:36: error: class, interface, or enum expected
        }
        ^
Main.java:37: error: class, interface, or enum expected
        for (int i = 0; i < 26; i++)
                        ^
Main.java:37: error: class, interface, or enum expected
        for (int i = 0; i < 26; i++)
                                ^
Main.java:40: error: class, interface, or enum expected
                for (int j = 0; j < i; j++)
                                ^
Main.java:40: error: class, interface, or enum expected
                for (int j = 0; j < i; j++)
                                       ^
Main.java:45: error: class, interface, or enum expected
                        frea[j] -= m;
                        ^
Main.java:46: error: class, interface, or enum expected
                        freb[i] -= m;
                        ^
Main.java:47: error: class, interface, or enum expected
                    }
                    ^
Main.java:50: error: class, interface, or enum expected
                }
                ^
Main.java:54: error: class, interface, or enum expected
                break;
                ^
Main.java:55: error: class, interface, or enum expected
            }
            ^
Main.java:58: error: class, interface, or enum expected
        for(int i=0;i<26;i++)
                    ^
Main.java:58: error: class, interface, or enum expected
        for(int i=0;i<26;i++)
                         ^
Main.java:62: error: class, interface, or enum expected
                break;
                ^
Main.java:63: error: class, interface, or enum expected
            }
            ^
Main.java:67: error: class, interface, or enum expected
        else
        ^
Main.java:69: error: class, interface, or enum expected
    }
    ^
Main.java:71: error: class, interface, or enum expected
}
^
45 errors

Standard output is empty