P1886 滑动窗口 /【模板】单调队列

R42580010

problem/P1886/P1886.cpp

@@ -0,0 +1,37 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+struct node {
+    int key, val;
+} a[1000005];
+
+int n, k;
+deque<node> q;
+
+int main() {
+    cin >> n >> k;
+    for (int i = 1; i <= n; i++) {
+        a[i].key = i;
+        cin >> a[i].val;
+    }
+    // 最小值
+    for (int i = 1; i <= n; i++) {
+        while (!q.empty() && a[i].val <= q.front().val) q.pop_front();
+        q.push_front(a[i]);
+        while (q.back().key <= i - k) q.pop_back();
+        if (i >= k) cout << q.back().val << ' ';
+    }
+    q.clear();
+    cout << endl;
+    // 最大值
+    for (int i = 1; i <= n; i++) {
+        while (!q.empty() && a[i].val >= q.front().val) q.pop_front();
+        q.push_front(a[i]);
+        while (q.back().key <= i - k) q.pop_back();
+        if (i >= k) cout << q.back().val << ' ';
+    }
+    q.clear();
+    cout << endl;
+    return 0;
+}