import sys
input=sys.stdin.readline
def main2(n,m,b_,lr):
  from heapq import heappop,heappush
  b=[x*(-1)**i for i,x in enumerate(b_)]
  lr.sort(key=lambda x:x[0])
  ary=[0]*(n+1)
  now=0
  for i in range(n):
    now-=ary[i]
    stc=[]
    mir=n
    d=0
    while lr and lr[0][0]-1==i:
      l,r=heappop(lr)
      stc.append(r)
      mir=min(mir,r)
      d=b[i]-now
    ary[mir]+=d
    for r in stc:
      if r==mir:continue
      heappush(lr,[mir+1,r])
    now+=d
    if b[i]==now:
      pass
    else:
      return False
  return True
if __name__=='__main__':
  n,m=map(int,input().split())
  b=list(map(int,input().split()))
  lr=[list(map(int,input().split())) for _ in range(m)]
  ret2=main2(n,m,b,lr)
  print('YES' if ret2 else 'NO')