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import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class sia {
	
	static int n, m;
	static long[] a, sum, lastCutH, lastCutD;
	static int[] lastCutI;
	static int lastCutLength = 1;
	static long d, b;
	
	public static void main(String[] args) {
		n = R.i();
		m = R.i();
		
		a = new long[n];
		for (int i = 0; i < n; i++) {
			a[i] = R.l();
		}
		Arrays.sort(a);

		sum = new long[n + 1];
		sum[n] = 0;
		for (int i = n - 1; i >= 0; i--) {
			sum[i] = sum[i + 1] + a[i];
		}
		
		lastCutI = new int[n + 1];
		lastCutH = new long[n + 1];
		lastCutD = new long[n + 1];
		lastCutI[0] = 0;
		lastCutH[0] = 0;
		lastCutD[0] = 0;
		lastCutLength = 1;

		
		int ftc;
		int lc;
		for (int j = 0; j < m; j++) {
			d = R.l();
			b = R.l();
			
			if (currentHeight(n - 1) <= b) {
				W.in(0);
			} else {
				ftc = firstToCut(0, n - 1);
				lc = lastCut(ftc, 0, lastCutLength - 1);
				
				int currentI = ftc;
				int nextI;
				BigInteger result = BigInteger.ZERO;
				for (int x = lc; x < lastCutLength; x++) {
					nextI = (x < lastCutLength - 1) ? lastCutI[x + 1] : n;
					result = result
							.add(BigInteger.valueOf(sum[currentI] - sum[nextI]).multiply(BigInteger.valueOf(d - lastCutD[x])))
							.add(BigInteger.valueOf(lastCutH[x] - b).multiply(BigInteger.valueOf(nextI - currentI)));
					currentI = nextI;
				}
				
				if (lastCutI[lc] == ftc) {
					lastCutD[lc] = d;
					lastCutH[lc] = b;
					lastCutLength = lc + 1;
				} else {
					lastCutI[lc + 1] = ftc;
					lastCutD[lc + 1] = d;
					lastCutH[lc + 1] = b;
					lastCutLength = lc + 2;
				}
				
				W.sn(result.toString());
			}
		}
		
		W.flush();
	}
	
	
	static int lastCut(int i, int left, int right) {
		if (left == right) return left;
		int middle = (left + right) / 2 + ((left + right) % 2);
		if (lastCutI[middle] > i) {
			return lastCut(i, left, middle - 1);
		} else {
			return lastCut(i, middle, right);
		}
	}
	
	static long currentHeight(int i) {
		int lc = lastCut(i, 0, lastCutLength - 1);
		long lch = lastCutH[lc];
		long lcd = lastCutD[lc];
		return a[i] * (d - lcd) + lch;
	}
	
	static int firstToCut(int left, int right) {
		if (left == right) return left;
		int middle = (left + right) / 2;
		long ch = currentHeight(middle);
		if (ch <= b) {
			return firstToCut(middle + 1, right);
		} else {
			return firstToCut(left, middle);
		}
	}
	
	
	static class R {
		static InputStream is=new BufferedInputStream(System.in);
		static int b='\n';
		static void next(){try{b=is.read();}catch(Exception e){}}
		static void skip(){while(b=='\n'||b==' '||b=='\r'||b=='\t')next();}
		static char c(){skip();char c=(char)b;next();return c;}
		static int i(){skip();int i=0;while(b>='0'&&b<='9'){i=10*i+(b-'0');next();}return i;}
		static long l(){skip();long i=0;while(b>='0'&&b<='9'){i=10*i+(b-'0');next();}return i;}
	}
	static class W {
		static OutputStream os=new BufferedOutputStream(System.out,4096);
		static void b(int b){try{os.write(b);}catch(Exception e){}}
		static void c(char c){b(c);}
		static void cs(char c){c(c);space();}
		static void cn(char c){c(c);newLine();}
		static void i(int i){if(i>9)i(i/10);b('0'+(i%10));}
		static void is(int i){i(i);space();}
		static void in(int i){i(i);newLine();}
		static void l(long l){if(l>9)l(l/10);b('0'+(int)(l%10));}
		static void ls(long l){l(l);space();}
		static void ln(long l){l(l);newLine();}
		static void s(String s){try{os.write(s.getBytes());}catch(Exception e){}}
		static void ss(String s){s(s);space();}
		static void sn(String s){s(s);newLine();}
		static void tn(boolean b){sn(b?"TAK":"NIE");}
		static void space(){b(' ');}
		static void newLine(){b('\n');}
		static void flush(){try{os.flush();}catch(Exception e){}};
	}
	static class T {
		static List<String> s=new ArrayList<String>();
		static List<Long> t=new ArrayList<Long>();
		static void t(String n){s.add(n);t.add(System.currentTimeMillis());}
		static void err(){t.add(System.currentTimeMillis());System.err.println();for(int i=0;i<s.size();i++){System.err.println(s.get(i)+": "+(t.get(i+1)-t.get(i)));}System.err.println("TOTAL: "+(t.get(t.size() - 1)-t.get(0)));System.err.flush();}
	}

}