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

//
#define int long long
#define pb(x) push_back(x)
#define m0(x) memset((x), 0, sizeof(x))
#define mm(x) memset((x), -1, sizeof(x))

//container
#define ALL(x) (x).begin(), (x).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define EACH(i, c) for (typeof((c).begin()) i = (c).begin(); i != (c).end(); ++i)
#define EXIST(s, e) ((s).find(e) != (s).end())
#define UNIQUE(v) (v).erase(unique((v).begin(), (v).end()), (v).end());
#define PERM(c) \
  sort(ALL(c)); \
  for (bool c##p = 1; c##p; c##p = next_permutation(ALL(c)))

// debug
#define GET_VAR_NAME(variable) #variable
#define test(x) cout << GET_VAR_NAME(x) << " = " << x << endl;

// bit_macro
#define bit(n) (1LL << (n))
#define bitset(a, b) (a) |= (1 << (b))
#define bitunset(a, b) (a) |= ~(1 << (b))
#define bitcheck(a, b) ((((a) >> (b)) & 1) == 1)
#define bitcount(a) __builtin_popcountll((a))

//typedef
typedef long long lint;
typedef pair<int, int> P;
typedef tuple<int, int, int> TP;
typedef vector<int> vec;
typedef vector<vec> mat;

//constant
const int INF = (int)1e18;
const int MOD = (int)1e9 + 7;
const double EPS = (double)1e-10;
const int dx[] = {-1, 0, 0, 1, 0, -1, -1, 1, 1};
const int dy[] = {0, -1, 1, 0, 0, 1, -1, 1, -1};

//
template <typename T>
void chmax(T &a, T b) { a = max(a, b); }
template <typename T>
void chmin(T &a, T b) { a = min(a, b); }
//
inline int toInt(string s) {
  int v;
  istringstream sin(s);
  sin >> v;
  return v;
}
template <class T>
inline string toString(T x) {
  ostringstream sout;
  sout << x;
  return sout.str();
}

//
struct Accelerate_Cin {
  Accelerate_Cin() {
    cin.tie(0);
    ios::sync_with_stdio(0);
    cout << fixed << setprecision(20);
  };
};

//重み付きUnionFind
/*
  呼び出し方：

  UnionFind<int> uf(N); //n=Nで初期化
*/

template <class Abel>
struct UnionFind {
  vector<int> par;
  vector<int> rank;
  vector<Abel> diff_weight;

  UnionFind(int n = 1, Abel SUM_UNITY = 0) {
    init(n, SUM_UNITY); //SUM_UNITY:アーベル群の単位元
  }

  void init(int n = 1, Abel SUM_UNITY = 0) {
    par.resize(n);
    rank.resize(n);
    diff_weight.resize(n);
    for (int i = 0; i < n; i++) {
      par[i] = i, rank[i] = 0, diff_weight[i] = SUM_UNITY;
    }
  }

  int root(int x) {
    if (par[x] == x) {
      return x;
    } else {
      int r = root(par[x]);
      diff_weight[x] += diff_weight[par[x]];
      return par[x] = r;
    }
  }

  Abel weight(int x) {
    root(x);
    return diff_weight[x];
  }

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

  bool unit(int x, int y, Abel w) {
    w += weight(x);
    w -= weight(y);

    x = root(x), y = root(y);
    if (x == y) return false;
    if (rank[x] < rank[y]) swap(x, y), w = -w;
    if (rank[x] == rank[y]) rank[x]++;
    par[y] = x;
    diff_weight[y] = w;
    return true;
  }

  Abel diff(int x, int y) {
    return weight(y) - weight(x);
  }
};

signed main() {
  int N, M;
  cin >> N >> M;

  UnionFind<int> uf(N);

  for (int i = 0; i < M; i++) {
    int l, r, d;
    cin >> l >> r >> d;
    l--, r--;
    if (uf.same(l, r)) {
      if (d != uf.diff(l, r)) {
        cout << "No" << endl;
        return 0;
      }
    } else {
      uf.unit(l, r, d);
    }
  }

  cout << "Yes" << endl;
  return 0;
}


Measured memory_bytes: 2560