P2234 [HNOI2002]营业额统计

R44585310

Luogu/problem/P2234/P2234.cpp

@@ -0,0 +1,25 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    int n, x, sum = 0;
+    vector<int> a;
+    cin >> n >> x;
+    a.push_back(0xc0c0c0c1);
+    a.push_back(x);
+    sum += x;
+    for (int i = 2; i <= n; i++) {
+        cin >> x;
+        int t1 = *--lower_bound(a.begin(), a.end(), x);
+        int t2 = *lower_bound(a.begin(), a.end(), x);
+        if (t1 == -0x3f3f3f3f) {
+            sum += abs(t2 - x);
+        } else {
+            sum += min(abs(t1 - x), abs(t2 - x));
+        }
+        a.insert(upper_bound(a.begin(), a.end(), x), x);
+    }
+    cout << sum << endl;
+    return 0;
+}