new file: P3572.cpp

P3572.cpp

@@ -0,0 +1,25 @@
+#include <bits/stdc++.h>
+using namespace std;
+int n, k, q, d[1000005], f[1000005];
+typedef pair<int, int> pii;
+pair<int, int> qq[4000005];
+int lq = 1, rq = 0;
+int main()
+{
+    scanf("%d", &n);
+    for (int i = 1; i <= n; i++)
+        scanf("%d", &d[i]);
+    scanf("%d", &q);
+    while(q--){
+        scanf("%d", &k);
+		lq = 1, rq = 1;
+		qq[1] = {0, 1};
+        for(int i = 2; i <= n; ++i) {
+			while(lq <= rq && qq[lq].second < i - k) ++lq;
+            f[i] = qq[lq].first + (d[qq[lq].second] <= d[i]);
+            while(lq <= rq && (qq[rq].first > f[i] || (qq[rq].first == f[i] && d[qq[rq].second] <= d[i]))) --rq;
+            qq[++rq] = {f[i], i};
+        }
+        printf("%d\n", f[n]);
+    }
+}