#include <bits/stdc++.h>
using namespace std;

// #define int long long
#define rep(i, n) for (int i = (int)(0); i < (int)(n); ++i)
#define reps(i, n) for (int i = (int)(1); i <= (int)(n); ++i)
#define rrep(i, n) for (int i = ((int)(n)-1); i >= 0; i--)
#define rreps(i, n) for (int i = ((int)(n)); i > 0; i--)
#define irep(i, m, n) for (int i = (int)(m); i < (int)(n); ++i)
#define ireps(i, m, n) for (int i = (int)(m); i <= (int)(n); ++i)
#define SORT(v, n) sort(v, v + n);
#define REVERSE(v, n) reverse(v, v+n);
#define vsort(v) sort(v.begin(), v.end());
#define all(v) v.begin(), v.end()
#define mp(n, m) make_pair(n, m);
#define cout(d) cout<<d<<endl;
#define coutd(d) cout<<std::setprecision(10)<<d<<endl;
#define cinline(n) getline(cin,n);
#define replace_all(s, b, a) replace(s.begin(),s.end(), b, a);
#define PI (acos(-1))
#define FILL(v, n, x) fill(v, v + n, x);
#define sz(x) int(x.size())

using ll = long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using vs = vector<string>;
using vpll = vector<pair<ll, ll>>;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

const ll INF = 1e15;
const int MOD = 1e9+7;
const ll LINF = 1e18;

ll n,m;
vpll G[100005];
bool checked[100005];
ll dist[100005];

signed main()
{
  cin.tie( 0 ); ios::sync_with_stdio( false );
  cin>>n>>m;
  rep(i,m){
    ll a,b,c; cin>>a>>b>>c;
    a--,b--;
    G[a].emplace_back(b,c);
    G[b].emplace_back(a,-c);
  }
  queue<pll> q;
  rep(i,n){
    if(checked[i]) continue;
    checked[i]=true;
    q.emplace(i,0);
    dist[i]=0;
    while(!q.empty()){
      ll v=q.front().first, c=q.front().second;
      q.pop();
      for(auto np: G[v]){
        ll nv=np.first, nc=np.second;
        if(checked[nv]){
          if(dist[nv]!=dist[v]+nc){
            cout<<"No"<<endl;
            return 0;
          }
          continue;
        }
        dist[nv]=dist[v]+nc;
        q.emplace(nv,dist[nv]);
        checked[nv]=true;
      }
    }
  }
  cout<<"Yes"<<endl;
  
}