func_code_string: #include <bits/stdc++.h>   using namespace std;   long long read() {     long long ans = 0, f = 1;     char c = getchar();     while (c >  9  || c <  0 ) {       if (c ==  - ) f = -1;       c = getchar();     }     while (c >=  0  && c <=  9 ) {       ans = ans * 10 + c -  0 ;       c = getchar();     }     return ans * f;   }   const long long N = 2e5 + 5;   long long t, n, m, k, x[N], y[N], ans, mmax[N];   signed main() {     t = read();     while (t--) {       n = read();       k = read();       for (long long i = 1; i <= n; ++i) x[i] = read();       for (long long i = 1; i <= n; ++i) y[i] = read();       sort(x + 1, x + 1 + n);       long long now = 0;       ans = 0;       for (long long i = 1; i <= n; ++i) {         long long len = upper_bound(x + 1, x + 1 + n, x[i] + k) - x - 1;         now = max(now, mmax[i]);         ans = max(ans, len - i + 1 + now);         mmax[len + 1] = max(mmax[len + 1], len - i + 1);       }       for (long long i = 1; i <= n + 1; ++i) mmax[i] = 0;       printf( %lld n , ans);     }     return 0;   }   