789. 数的范围

https://www.acwing.com/problem/content/submission/code_detail/6604256/
2024-12-24 03:31:59 +00:00 · 2021-07-22 15:17:08 +08:00 · 2021-07-22 15:17:08 +08:00 · 0f19c2debc
commit 0f19c2debc
parent 1ac51c9103
1 changed files with 42 additions and 0 deletions
--- a/AcWing/789/789.cpp
+++ b/AcWing/789/789.cpp
@ -0,0 +1,42 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int n, q, t, k, a[100005];
+
+int main() {
+    cin >> n >> q;
+    for (int i = 0; i < n; i++) {
+        cin >> a[i];
+    }
+    for (int i = 0; i < q; i++) {
+        cin >> k;
+        int l = 0;
+        int r = n - 1;
+        while (l < r) {
+            int mid = l + r >> 1;
+            if (a[mid] >= k) {
+                r = mid;
+            } else {
+                l = mid + 1;
+            }
+        }
+        if (a[l] != k) {
+            cout << -1 << ' ' << -1 << endl;
+            continue;
+        }
+        cout << l << ' ';
+        l = 0;
+        r = n - 1;
+        while (l < r) {
+            int mid = l + r + 1 >> 1;
+            if (a[mid] <= k) {
+                l = mid;
+            } else {
+                r = mid - 1;
+            }
+        }
+        cout << l << endl;
+    }
+    return 0;
+}