new file: P17831.cpp

P17831.cpp

@@ -0,0 +1,44 @@
+#include<bits/stdc++.h>
+using namespace std;
+int n;
+long long m;
+long long a[500005];
+long long qsum[500005];
+bool checkb(int mid, long long now, int tot) {
+    return mid * now - (qsum[tot] - qsum[tot - mid]) <= m;
+}
+long long check(long long now, int tot) {
+    long long nowm = m;
+    long long ans = 0;
+    int l = 1, r = tot, mid = (l + r) >> 1;
+    while(l < r) {
+        mid = (l + r) >> 1;
+        if(checkb(mid, now, tot)) {
+            l = mid + 1;
+        } else {
+            r = mid;
+        }
+    }
+    while(!checkb(mid, now, tot) && mid >= 1) mid--;
+    while(checkb(mid + 1, now, tot) && mid + 1 <= tot) mid++;
+    return mid;
+}
+int main() {
+    scanf("%d%lld", &n, &m);
+    for(int i = 1; i <= n; ++i) scanf("%lld", &a[i]);
+    sort(a + 1, a + n + 1);
+    for(int i = 1; i <= n; ++i) qsum[i] = qsum[i - 1] + a[i];
+    long long ans = 0;
+    for(int i = 1; i <= n; ++i) {
+        if(a[i + 1] == a[i]) continue;
+        ans = max(ans, check(a[i], i));
+        // printf("%d %lld\n", i, check(a[i], i));
+    }
+    printf("%lld\n", ans);
+    return 0;
+}
+/*
+g++ crystal/crystal.cpp -o crystal/crystal -std=c++14 -O2 -static -Wall && cp crystal/crystal ~ && chmod +x ~/crystal && ~/crystal
+O(n log n)
+100pts
+*/