D - Trophy

https://atcoder.jp/contests/abc258/submissions/32915701

AtCoder/ABC258/D/D.cpp

@@ -0,0 +1,29 @@
+#include <iostream>
+#include <limits>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 2e5 + 5;
+
+int n, x, a, b;
+long long sum, ans = std::numeric_limits<long long>::max();
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n >> x;
+
+    for (int i = 1; i <= std::min(x, n); i++) {
+        cin >> a >> b;
+
+        sum += a + b;
+        ans = std::min(ans, sum + 1ll * (x - i) * b);
+    }
+
+    cout << ans << endl;
+
+    return 0;
+}