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OI-codes/Luogu/CF1445A/CF1445A.cpp

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#include <bits/stdc++.h>
using namespace std;
int main() {
int t;
cin >> t;
while (t--) {
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int n, x, a[55], b[55];
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bool flag = false;
cin >> n >> x;
for (int i = 0; i < n; i++) {
cin >> a[i];
}
for (int i = 0; i < n; i++) {
cin >> b[i];
}
sort(a, a + n);
sort(b, b + n);
reverse(b, b + n);
for (int i = 0; i < n; i++) {
if (a[i] + b[i] > x) {
flag = true;
}
}
if (flag) {
cout << "No" << endl;
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} else {
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cout << "Yes" << endl;
}
}
return 0;
}