Add 31637.cpp

31xxx/31637.cpp

@@ -0,0 +1,24 @@
+#include <algorithm>
+#include <iostream>
+#include <vector>
+using namespace std;
+
+bool solve(void) {
+  int n, d; cin >> n >> d;
+  vector<int> a(2*n);
+  for (int i=0; i<2*n; i++) cin >> a[i];
+  sort(a.begin(), a.end());
+
+  for (int i=0; i<2*n; i+=2) {
+    if (a[i+1] - a[i] > d) return false;
+  }
+  return true;
+}
+
+int main(void) {
+  ios::sync_with_stdio(false);
+  cin.tie(nullptr);
+
+  cout << (solve() ? "Yes" : "No");
+  return 0;
+}