B - Promo

https://codeforces.com/contest/1697/submission/160295805

Codeforces/1697/B/B.cpp

@@ -0,0 +1,38 @@
+#include <iostream>
+#include <algorithm>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 2e5 + 5;
+
+int n, q, p[N];
+long long s[N];
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n >> q;
+
+    for (int i = 1; i <= n; i++) {
+        cin >> p[i];
+    }
+
+    std::sort(p + 1, p + 1 + n, std::greater<int>());
+
+    for (int i = 1; i <= n; i++) {
+        s[i] = s[i - 1] + p[i];
+    }
+
+    while (q--) {
+        int x, y;
+
+        cin >> x >> y;
+
+        cout << s[x] - s[x - y] << endl;
+    }
+
+    return 0;
+}