Add 09027.cpp

09xxx/09027.cpp

@@ -0,0 +1,26 @@
+#include <algorithm>
+#include <iostream>
+#include <vector>
+using namespace std;
+
+void solve(void) {
+  int n; cin >> n;
+  vector<long long> a(n), b(n);
+  for (int i=0; i<n; i++) cin >> a[i];
+  for (int i=0; i<n; i++) cin >> b[i];
+  for (int i=1; i<n; i++) b[i] += b[i-1];
+
+  vector<long long> dp(n); dp[0] = 0;
+  for (int i=1; i<n; i++) dp[0] += (a[i] - a[0]) * (b[i] - b[i-1]);
+  for (int i=1; i<n; i++) dp[i] = dp[i-1] + (a[i] - a[i-1]) * (2 * b[i-1] - b[n-1]);
+  cout << a[distance(dp.begin(), min_element(dp.begin(), dp.end()))] << "\n";
+}
+
+int main(void) {
+  ios::sync_with_stdio(false);
+  cin.tie(nullptr);
+
+  int t; cin >> t;
+  while (t--) solve();
+  return 0;
+}