'commit'

TangDou/AcWing/LIS/896_ErFen.cpp

@@ -0,0 +1,38 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+const int N = 1e5 + 10;
+
+int a[N];
+int f[N], idx;
+
+int find(int x) {
+    int l = 1, r = idx; //左闭右闭
+    while (l < r) {
+        int mid = (l + r) >> 1;
+        if (f[mid] >= x)
+            r = mid;
+        else
+            l = mid + 1;
+    }
+    return l;
+}
+
+int main() {
+    int n;
+    scanf("%d", &n);
+    for (int i = 1; i <= n; i++) scanf("%d", &a[i]);
+
+    f[++idx] = a[1];
+
+    for (int i = 2; i <= n; i++)
+        if (a[i] > f[idx])
+            f[++idx] = a[i];
+        else {
+            int pos = find(a[i]);
+            f[pos] = a[i];
+        }
+
+    printf("%d\n", idx);
+    return 0;
+}