import sys
sys.setrecursionlimit(10**5)
class UnionFind():
  def __init__(self, n):
    self.n = n
    self.root = [-1]*(n+1)
    self.rnk = [0]*(n+1)
    self.weight = [0]*(n+1)
  def Find_Root(self, x):
    if(self.root[x] < 0):
      return x
    else:
      r = self.Find_Root(self.root[x])
      self.weight[x] += self.weight[self.root[x]]
      self.root[x] = r
      return r
  def GetWeight(self, x):
    self.Find_Root(x)
    return self.weight[x]
  def Unite(self, x, y, w):
    w += self.GetWeight(x)
    w -= self.GetWeight(y)
    x = self.Find_Root(x)
    y = self.Find_Root(y)
    if(x == y):
      return False
    if self.rnk[x] < self.rnk[y]:
      x, y = y, x
      w = -w
    if self.rnk[x] == self.rnk[y]:
      self.rnk[x] += 1
    self.root[y] = x
    self.weight[y] = w
    return True
  def isSameGroup(self, x, y):
    return self.Find_Root(x) == self.Find_Root(y)
  def Count(self, x):
    return -self.root[self.Find_Root(x)]
  def Diff(self, x, y):
    return self.GetWeight(y) - self.GetWeight(x)
  
def main():
  N, M = map(int, input().split())
  lrd = [list(map(int, input().split())) for _ in range(M)]
  U = UnionFind(N)
  for i in range(M):
    l, r, d = lrd[i]
    if not U.isSameGroup(l, r):
      U.Unite(l, r, d)
    else:
      if U.Diff(l, r) != d:
        print('No')
        exit()
  print('Yes')
  
    
if __name__ == "__main__":
  main()