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#include <stdio.h>
#include <stdlib.h>

#define MAX(a,b) ((a>b)?(a):(b))
#define MIN(a,b) ((a<b)?(a):(b))

#define MAXGROW 1000000000000LL

static inline long long __min(long long a, long long b) { return a < b ? a : b; }

#define MAXSIZE 500000

int speed[1 + MAXSIZE + 50];
int grass[1 + MAXSIZE + 50];


int main(int argc, char *argv[])
{
     int n;
     int m; /* ilość koszeń */
     int i, j;

     scanf("%d %d", &n, &m);
     for (i = 1; i <= n; i++) {
	  scanf("%d", &speed[i]);
     }

     for (i = 1; i <= m; i++) {
	  long long tmp;
	  long long lim;

	  scanf("%lld %lld", &tmp, &lim);

	  tmp = 0;
	  for (j = 1; j <= n; j++) {
	       grass[j] = __min(speed[j]+grass[j], MAXGROW);

	       if (grass[j] > lim) {
		    tmp += grass[j] - lim;
		    grass[j] = lim;
	       }
	  }
	  printf("%lld\n", tmp);
     }

     return 0;
}