from collections import defaultdict
import heapq
n,q = map(int,input().split())
lr = [[int(i)-1 for i in input().split()] for j in range(q)]

lr.sort(key=lambda x:x[0])
li = [10**9]*n

rm = defaultdict(int)
idx = 0
lrcnt = 0
hp = []
heapq.heapify(hp)
rmhp = []
heapq.heapify(rmhp)

while idx < n:
    while lrcnt < q and lr[lrcnt][0] <= idx:
        heapq.heappush(hp, -lr[lrcnt][2])
        heapq.heappush(rmhp, [lr[lrcnt][1],-lr[lrcnt][2]])
        lrcnt += 1
    while 1:
        if len(rmhp) == 0:
            break
        pos,val = heapq.heappop(rmhp)
        if pos < idx:
            rm[val] += 1
        else:
            heapq.heappush(rmhp, [pos,val])
            break
    while 1:
        if len(hp) == 0:
            li[idx] = 10**9
            break
        val = heapq.heappop(hp)
        if rm[val] > 0:
            rm[val] -= 1
        else:
            li[idx] = -val+1
            heapq.heappush(hp, val)
            break
    idx += 1
    
print(*li)