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

#define fs first
#define sc second
#define pb emplace_back
#define mp make_pair
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()

const int32_t inf = 1001001001;
const int64_t infll = 1001001001001001001ll;
const int dx[] = {0, -1, 1, 0, -1, 1, -1, 1}, dy[] = {-1, 0, 0, 1, -1, -1, 1, 1};

template <typename T> using vector2d = vector<vector<T>>;

// clang-format off
template <typename T> void sort(vector<T> &v) { sort(all(v)); }
// ostream &operator<<(ostream &os, __int128_t value) { if (ostream::sentry(os)) { __uint128_t tmp = value < 0 ? -value : value; char buffer[64]; char *d = end(buffer); do { --d; *d = "0123456789"[tmp % 10]; tmp /= 10; } while (tmp != 0); if (value < 0) { --d; *d = '-'; } int len = end(buffer) - d; if (os.rdbuf()->sputn(d, len) != len) { os.setstate(ios_base::badbit); }} return os; }
// istream &operator>>(istream &is, __int128_t &value) { string in; is >> in; value = 0; for (const char &c : in) { if ('0' <= c && c <= '9') value = 10 * value + (c - '0'); } if (in[0] == '-') value *= -1; return is; }
// ostream &operator<<(ostream &os, __uint128_t value) { if (ostream::sentry(os)) { char buffer[64]; char *d = end(buffer); do { --d; *d = "0123456789"[value % 10]; value /= 10; } while (value != 0); int len = end(buffer) - d; if (os.rdbuf()->sputn(d, len) != len) { os.setstate(ios_base::badbit); }} return os; }
// istream &operator>>(istream &is, __uint128_t &value) { string in; is >> in; value = 0; for (const char &c : in) { if ('0' <= c && c <= '9') value = 10 * value + (c - '0'); } return is; }
template <typename T> ostream &operator<<(ostream &os, vector<T> &v) { os << v[0]; for (int i = 1; i < v.size(); ++i) os << " " << v[i]; return os; }
template <typename T> istream &operator>>(istream &is, vector<T> &v) { for (T &in : v) is >> in; return is; }
template <typename T1, typename T2> ostream &operator<<(ostream &os, pair<T1, T2> p) { os << p.fs << " " << p.sc; return os; }
template <typename T1, typename T2> istream &operator>>(istream &is, pair<T1, T2> &p) { is >> p.fs >> p.sc; return is; }

struct IoSetup { IoSetup(){ cin.tie(0); ios::sync_with_stdio(0); cout << fixed << setprecision(10); cerr << fixed << setprecision(10); } } iosetup;

inline int64_t in() { int64_t x = 0; cin >> x; return x; }
template <typename T1, typename T2> inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }
template <typename T1, typename T2> inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }
// clang-format on

struct UnionFind {
  UnionFind(size_t size) : v(size, -1) {}
  vector<int> v;

  int root(int x) {
    return (v[x] < 0 ? x : v[x] = root(v[x]));
  }

  bool is_root(int x) {
    return x == root(x);
  }

  bool same(int x, int y) {
    return root(x) == root(y);
  }

  void unite(int x, int y) {
    x = root(x);
    y = root(y);
    if (x != y) {
      if (v[x] > v[y]) swap(x, y);
      v[x] += v[y];
      v[y] = x;
    }
  }

  int size(int x) {
    return -v[x];
  }
};

struct edge {
  int to, cost;

  edge(int to, int cost) : to(to), cost(cost) {}
};

vector<int> x, used;
vector2d<edge> G;

void dfs(int v, int po) {
  if (used[v]) return;
  used[v] = true;
  x[v] = po;
  for (auto e : G[v]) {
    dfs(e.to, po + e.cost);
  }
}

signed main(int argc, char *argv[]) {
  int n = in(), m = in();
  UnionFind uf(n);
  x.resize(n);
  used.resize(n);
  G.resize(n);

  vector<int> l(m), r(m), d(m);
  for (int i = 0; i < m; ++i) {
    l[i] = in() - 1, r[i] = in() - 1, d[i] = in();
    G[l[i]].pb(edge(r[i], d[i]));
    G[r[i]].pb(edge(l[i], -d[i]));
    uf.same(l[i], r[i]);
  }

  for (int i = 0; i < n; ++i) {
    if (!uf.is_root(i)) continue;
    dfs(i, 0);
  }

  for (int i = 0; i < m; ++i) {
    if (x[r[i]] - x[l[i]] != d[i]) {
      cout << "No" << endl;
      return 0;
    }
  }

  cout << "Yes" << endl;
}


Measured memory_bytes: 14208