// Slower C++ solution:
#include<iostream>

#include<cstdio>

#include<cstdlib>

#include<algorithm>

#include<cmath>

#include<vector>

#include<set>

#include<map>

#include<unordered_set>

#include<unordered_map>

#include<queue>

#include<ctime>

#include<cassert>

#include<complex>

#include<string>

#include<cstring>

#include<chrono>

#include<random>

#include<bitset>



#define fi first

#define se second

#define mp make_pair

#define eb emplace_back

#define all(v) v.begin(), v.end()

#define sz(v) (int) v.size()



using namespace std;



mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());



typedef long long lox;

typedef long double lod;

typedef unsigned long long pox;

typedef pair<int, int> pii;



const int MAX_N = 1e5 + 5;



int n, m;

vector<pii> g[MAX_N];

int x[MAX_N], deg_in[MAX_N];

bool used[MAX_N];



void dfs(int v) {

	used[v] = true;

	for (auto &e : g[v]) {

		int u = e.fi, w = e.se;

		if (!used[u]) {

			x[u] = x[v] + w;

			dfs(u);

		}

	}

}



signed main() {

	ios_base::sync_with_stdio(0);

	cin.tie(0);

	cin >> n >> m;

	for (int i = 1; i <= m; ++i) {

		int l, r, d;

		cin >> l >> r >> d;

		g[l].eb(r, d);

		deg_in[r]++;

	}

	for (int i = 1; i <= n; ++i) {

		if (!deg_in[i]) {

			dfs(i);

		}

	}

	for (int v = 1; v <= n; ++v) {

		for (auto &e : g[v]) {

			int u = e.fi, w = e.se;

			if (x[u] != x[v] + w) {

				cout << "No\n";

				return 0;

			}

		}

	}

	cout << "Yes\n";

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 3.4878493903571175x):
#include <bits/stdc++.h>

#include <ext/pb_ds/assoc_container.hpp>

#include <ext/pb_ds/trie_policy.hpp>

#include <ext/rope>



//#pragma 03

//#pragma GCC optimize("Ofast")

//#pragma GCC optimization("unroll-loops, no-stack-protector")

//#pragma GCC target("sse,sse2,sse3,ssse3,sse4.1,sse4.2")



#define ll long long

#define ld long double

#define fi first

#define se second

#define sz(x) x.size()

#define mp make_pair

#define pb push_back

#define eb emplace_back

#define all(x) begin(x), end(x)

#define rall(x) rbegin(x), rend(x)

#define rep(i, x, n) for (ll i = x; i < n; i++)

#define fastio() ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0)

//#define int long long



using namespace std;

using namespace __gnu_pbds;

using namespace __gnu_cxx;



mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());



typedef vector<int> vi;

typedef vector<vi> vvi;

typedef pair<int, int> ii;

typedef vector<pair<int, int> > vii;

typedef vector<ll> vl;

typedef vector<vl> vvl;

typedef pair<ll, ll> pll;

typedef vector<pll> vll;



inline void EXECUTE_TIME() {cout << endl << setprecision(10) << fixed << "CPU Time: " << clock() / double(CLOCKS_PER_SEC) << " sec(s)\n";}



template <class T> inline T RD(T &a) {T x; cin >> x; return a = x;}

template <class T> inline T gcd(T a, T b) {if (b) return gcd(b, a % b); else return a;}

template <class T> inline T lcm(T a, T b) {return a / gcd(a,b) * b;}

template<typename T> using ordered_set=tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

typedef trie<string, null_type, trie_string_access_traits<>, pat_trie_tag, trie_prefix_search_node_update> pref_trie;



const int N = 1e5 + 1;



vector<vii> adj;

bool check[N];

int dist[N];

bool FAIL;



void dfs(int u) {

    if (!check[u]) check[u] = true;

    for (ii v : adj[u]) {

        if (!check[v.fi]) {

            dist[v.fi] = dist[u] - v.se;

            dfs(v.fi);

        } else {

            if (dist[u] - v.second != dist[v.first]) FAIL = true;

        }

    }

}



signed main() {

//    freopen("connect.in", "r", stdin);

//    freopen("connect.out", "w", stdout);

    fastio();



    int n, m; cin >> n >> m;

    adj.assign(n, vii());



    int l, r, d;

    for (int i = 0; i < m; i++) {

        cin >> l >> r >> d; l--, r--;

        adj[l].pb({r, d});

        adj[r].pb({l, -d});

    }



    for (int i = 0; i < n; i++) {

        if (!check[i]) {

            dist[i] = 0;

            dfs(i);

        }

    }



    if (!FAIL) cout << "Yes";

    else cout << "No";



//    EXECUTE_TIME();

}