1260. 【例9.4】拦截导弹(Noip1999)

http://ybt.ssoier.cn:8088/statusx.php?runidx=15563317

ybt/1260/1260.cpp

@@ -0,0 +1,36 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 20005;
+
+int n, a[N], f[N], ans1, ans2;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    while (cin >> a[++n]) {}
+
+    for (int i = 1; i < n; i++) {
+        f[i] = 1;
+        for (int j = 1; j < i; j++) {
+            if (a[j] >= a[i]) f[i] = std::max(f[i], f[j] + 1);
+        }
+        ans1 = std::max(ans1, f[i]);
+    }
+
+    for (int i = 1; i < n; i++) {
+        f[i] = 1;
+        for (int j = 1; j < i; j++) {
+            if (a[j] < a[i]) f[i] = std::max(f[i], f[j] + 1);
+        }
+        ans2 = std::max(ans2, f[i]);
+    }
+
+    cout << ans1 << endl
+         << ans2 << endl;
+
+    return 0;
+}