Precreation contest files

misc/binary-search/ghepcap.cpp

@@ -0,0 +1,35 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int a[100000];
+
+int main() {
+  ios_base::sync_with_stdio(false);
+  cin.tie(NULL);
+  freopen("ghepcap.inp", "r", stdin);
+
+  int n;
+  cin >> n;
+  for (int i = 0; i < n; i++)
+    cin >> a[i];
+  sort(a, a + n);
+  // 89 90 91 99 100 101
+  int res = 0;
+  for (int j = 0; j < n; j++) {
+    int l = 0, r = j;
+    // int ans = a[n - 1];
+    while (l < r) {
+      int mid = (l + r) / 2;
+      if (10 * a[mid] < a[j] * 9) {
+        l = mid + 1;
+      } else {
+        r = mid;
+        // ans = min(ans, mid);
+      }
+    }
+    // res += j - ans;
+    res += j - l;
+  }
+  cout << res << '\n';
+}