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import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Arrays;

public class sia {
	
	public static void main(String[] args) throws NumberFormatException, IOException {
		
		BufferedReader bi = new BufferedReader(new InputStreamReader(System.in));
		String line;
		line = bi.readLine();
		long pow = Long.parseLong(line.split(" ")[0]);
		long sko = Long.parseLong(line.split(" ")[1]);
		line = bi.readLine();
		long wzr[] = Arrays.stream(line.split(" ")).mapToLong(Long::parseLong).toArray();
		long[] cur = new long[(int) pow];
		long dzi = 0;
		long ldzi = 0;
		long ilo = 0;
		long sum = 0;
		long count = 0;
		OutputStream out = new BufferedOutputStream ( System.out );
		while(count<sko) {
			line = bi.readLine();
			dzi = Long.parseLong(line.split(" ")[0]);
			ilo = Long.parseLong(line.split(" ")[1]);
			sum = 0;
			for(int i=0; i<wzr.length;i++) {
				cur[i] += wzr[i]*(dzi-ldzi);
				if(cur[i]>ilo) {
					sum+=cur[i]-ilo;
					cur[i] = ilo;
				}
			}
			out.write((sum + "\n").getBytes());
			ldzi = dzi;
			count++;
		}
		out.flush();
		out.close();
		
		
	}

}