P3112 [USACO14DEC]Guard Mark G

https://www.luogu.com.cn/record/85668298

Luogu/P3112/P3112.cpp

@@ -0,0 +1,72 @@
+#include <iostream>
+#include <algorithm>
+#include <limits>
+#include <tuple>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 25;
+
+int n, h, ans = -1;
+std::tuple<int, int, int> a[N];
+bool vis[N];
+
+void dfs(int x) {
+    if (x == n + 1) {
+        int hh = 0, ss = std::numeric_limits<int>::max();
+
+        for (int i = 1; i <= n; i++) {
+            if (!vis[i]) continue;
+
+            hh += std::get<0>(a[i]);
+
+            int sum = 0;
+
+            for (int j = i + 1; j <= n; j++) {
+                if (!vis[j]) continue;
+
+                sum += std::get<1>(a[j]);
+            }
+
+            ss = std::min(ss, std::get<2>(a[i]) - sum);
+        }
+
+        if (hh >= h) {
+            ans = std::max(ans, ss);
+        }
+
+        return;
+    }
+
+    dfs(x + 1);
+    vis[x] = true;
+    dfs(x + 1);
+    vis[x] = false;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n >> h;
+
+    for (int i = 1; i <= n; i++) {
+        cin >> std::get<0>(a[i]) >> std::get<1>(a[i]) >> std::get<2>(a[i]);
+    }
+
+    std::sort(a + 1, a + 1 + n, [&](decltype(a[0]) x, decltype(a[0]) y) -> bool {
+        return std::get<1>(x) + std::get<2>(x) > std::get<1>(y) + std::get<2>(y);
+    });
+
+    dfs(0);
+
+    if (ans == -1) {
+        cout << "Mark is too tall" << endl;
+    } else {
+        cout << ans << endl;
+    }
+
+    return 0;
+}