P1223 排队接水

R52646721

Luogu/problem/P1223/P1223.cpp

@@ -0,0 +1,23 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int n;
+double sum = 0.00;
+pair<int, int> a[1005];
+
+int main() {
+    cin >> n;
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i].first;
+        a[i].second = i;
+    }
+    sort(a + 1, a + 1 + n);
+    for (int i = 1; i <= n; i++) {
+        cout << a[i].second << ' ';
+        sum += a[i].first * (n - i);
+    }
+    cout << endl;
+    cout << fixed << setprecision(2) << sum / n << endl;
+    return 0;
+}