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import java.io.InputStream;
import java.io.PrintStream;
import java.util.Scanner;

public class sia {
    public static void main(String[] args) {
        InputStream in = System.in;
        PrintStream out = System.out;
        calculate(in, out);
    }

    public static int calculate(InputStream in, PrintStream out) {
        /** Read input and init tables */

        Scanner scanner = new Scanner(in);
        int n = Integer.valueOf(scanner.next());
        int m = Integer.valueOf(scanner.next());

        long a[] = new long[n];
        long g[] = new long[n];

        scanner.nextLine();
        for (int i = 0; i < n; i++) {
            a[i] =  Long.valueOf(scanner.next());
            g[i] = 0;
        }

        /** Calculate */
        long ld = 0;
        for (int j = 0; j < m; j++) {
            /** Read */
            scanner.nextLine();
            long d = Long.valueOf(scanner.next());
            long b = Long.valueOf(scanner.next());

            /** Cut each grass and summarize */
            long sum = 0;
            for (int i = 0; i < n; i++) {
                g[i] = g[i] + (d - ld) * a[i];
                if (g[i] > b) {
                   sum += g[i] - b;
                   g[i] = b;
                }
            }
            ld = d;

            /** Print result for cut */
            out.println(sum);
        }
        scanner.close();
        
        return 0;
    }
}