upload some new code

FZOI/纪念品分组.cpp

@@ -0,0 +1,35 @@
+#include <bits/stdc++.h>
+#define int long long
+#define endl "\n"
+#define IMX LONG_LONG_MAX
+#define IMN LONG_LONG_MIN
+#define debug$ if(dev)
+using namespace std;
+
+/* toothless. #17 */
+
+const int N = 1e7 + 10;
+const int M = 2e3 + 5;
+const bool dev = false;
+
+int w, ans = 0;
+int n, a[N];
+int l, r;
+
+signed main()
+{
+    cin >> w >> n;
+    for (int i = 1; i <= n; i++) cin >> a[i];
+    sort(a + 1, a + 1 + n);
+    l = 1;
+    r = n;
+    while (l <= r) {
+        if (a[l] + a[r] <= w) {
+            l++, r--, ans++;
+        } else {
+            r--, ans++;
+        }
+    }
+    cout << ans;
+    return 0;
+}