D,Q = map(int,input().split())
union = []
maxd = 0

for i in range(Q):
    s,t = map(int,input().split())
    index = len(union)
    for j in range(len(union)):
        if union[j][0]>s:
            index = j
            break
    t_bond,b_bond = False,False
    if index>0 and union[index-1][1]+1>=s:t_bond=True
    if index<len(union) and union[index][0]-1<=t:b_bond=True
    if t_bond and b_bond:
        union[index-1][1]=max(t,union[index][1])
        union.pop(index)
        index-=1
    elif t_bond:
        union[index-1][1]=max(t,union[index-1][1])
        index-=1
    elif b_bond:
        union[index][0]=s
        union[index][1]=max(t,union[index][1])
    else:
        union.insert(index,[s,t])
    maxd = max(maxd,union[index][1]-union[index][0]+1)
    print(maxd)
    print(union)