from collections import defaultdict
class UnionFind():
    def __init__(self, n):
        self.n = n
        self.parents = [-1] * n
    def find(self, x):
        # 要素xが属するグループの根
        if self.parents[x] < 0:
            return x
        else:
            self.parents[x] = self.find(self.parents[x])
            return self.parents[x]
    def union(self, x, y):
        # 要素xが属するグループと要素yが属するグループを併合
        x = self.find(x)
        y = self.find(y)
        if x == y:
            return
        if self.parents[x] > self.parents[y]:
            x, y = y, x
        self.parents[x] += self.parents[y]
        self.parents[y] = x
    def size(self, x):
        # 要素xが属するグループの要素数
        return -self.parents[self.find(x)]
    def same(self, x, y):
        # 要素x,yが同じグループに属するかどうか
        return self.find(x) == self.find(y)
    def members(self, x):
        # 要素xが属するグループに属する要素をリストで返す
        root = self.find(x)
        return [i for i in range(self.n) if self.find(i) == root]
    def roots(self):
        # すべての根の要素をリストで返す
        return [i for i, x in enumerate(self.parents) if x < 0]
    def group_count(self):
        # グループの数を返す（注）遅い
        return len(self.roots())
    def all_group_members(self):
        group_members = defaultdict(list)
        for member in range(self.n):
            group_members[self.find(member)].append(member)
        return group_members
    def __str__(self):
        return '\n'.join(f'{r}: {m}' for r, m in self.all_group_members().items())



import sys
sys.setrecursionlimit(500000)
#import pypyjit
#pypyjit.set_param('max_unroll_recursion=-1')
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int,sys.stdin.readline().rstrip().split())
def TI(): return tuple(map(int,sys.stdin.readline().rstrip().split()))
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))
def SI(): return sys.stdin.readline().rstrip()
def LS(): return list(sys.stdin.readline().rstrip())
#for i, pi in enumerate(p):
from collections import defaultdict,deque
import bisect
import itertools
dic = defaultdict(int)
d = deque()
YN = ['No','Yes']

N,Q = MI()
dp = [-1]*(N)
S = []
for _ in range(Q):
  a,b,c = MI()
  S.append((c,a-1,b-1))
S.sort()
uf =  UnionFind(N*2)
count = Q
for c,a,b in S:
  if not c:
    if uf.same(a+N,b) or uf.same(a,b+N):
      print(0)
      exit()
    if uf.same(a,b) or uf.same(a+N,b+N):
      count -= 1
    uf.union(a,b)
    uf.union(a+N,b+N)
  else:
    if uf.same(a,b) or uf.same(a+N,b+N):
      print(0)
      exit()
    if uf.same(a+N,b) or uf.same(a,b+N):
      count -= 1
    uf.union(a+N,b)
    uf.union(a,b+N)  
mod = 998244353
x = uf.all_group_members()
S = []
for i in x:
  s = []
  for j in x[i]:
    if 0 <= j <= N-1:
      s.append(j)
  if s:
    S.append(s)

print(pow(2,N-count,mod))