// Slower C++ solution:
#ifndef chafen

#define chafen



# include <cstdio>

# include <iostream>

# include <cstring>

# include <queue>

# pragma GCC optimize(2)

# define N 300000

# define INF 0x7f7f7f7f //0x7fffffff

# define _cin std::ios::sync_with_stdio(false)

# define rg register

# define il inline

struct edge{

    int next;

    int to;

    int w;

}e[(N+1)<<1];

int head[N+1];

int book[N+1];

int vis[N+1];

int dis[N+1];

int n,m;

using namespace std;

//template <class A> il bool SPFA(A s);

bool SPFA(int s);

int main()

{

    _cin;

    rg int edge_sum=0;

    rg int u,v,w;

    cin>>n>>m;

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

        cin>>u>>v>>w;

        //edge_sum++;

        e[i].next=head[u];

        e[i].to=v;

        e[i].w=w;

        head[u]=i;

        

        //edge_sum++;

        e[i+m].next=head[v];

        e[i+m].to=u;

        e[i+m].w=-w;

        head[v]=i+m;

    }

    memset(dis,0x7f,sizeof(dis));

    memset(vis,0,sizeof(vis));

    memset(book,0,sizeof(book));

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

        if(!vis[i]){

            vis[i]=1;

            if(!SPFA(i)){

                cout<<"No"<<endl;

                return 0;

            }

        }

    }

    cout<<"Yes"<<endl;

    return 0;

}

//template <class A> il bool SPFA(A s)

il bool SPFA(int s)

{

    queue <int> q;

    dis[s]=0;

    q.push(s);book[s]=1;

    while(q.size()>0){

        rg int k=q.front();q.pop();

        book[k]=0;

        for(rg int i = head[k];i;i=e[i].next){

            rg int tt=e[i].to;

            if(dis[k]<INF && dis[tt]<INF && dis[tt]!=dis[k]+e[i].w) return false;

			else if(dis[k]<INF && dis[tt] == INF){

                dis[tt]=dis[k]+e[i].w;

                if(book[tt] == false) {q.push(tt);book[tt]=1;}

                vis[tt]=1;

            }

        }

    }

    return true;

}



#endif

// Faster C++ solution for the same problem (measured speedup: 4.695936558121467x):
#define _CRT_SECURE_NO_WARNINGS

#pragma GCC optimize(2)

#pragma GCC optimize(3)

#pragma GCC optimize("Ofast")

#pragma GCC optimize("inline")

#pragma GCC optimize("-fgcse")

#pragma GCC optimize("-fgcse-lm")

#pragma GCC optimize("-fipa-sra")

#pragma GCC optimize("-ftree-pre")

#pragma GCC optimize("-ftree-vrp")

#pragma GCC optimize("-fpeephole2")

#pragma GCC optimize("-ffast-math")

#pragma GCC optimize("-fsched-spec")

#pragma GCC optimize("unroll-loops")

#pragma GCC optimize("-falign-jumps")

#pragma GCC optimize("-falign-loops")

#pragma GCC optimize("-falign-labels")

#pragma GCC optimize("-fdevirtualize")

#pragma GCC optimize("-fcaller-saves")

#pragma GCC optimize("-fcrossjumping")

#pragma GCC optimize("-fthread-jumps")

#pragma GCC optimize("-funroll-loops")

#pragma GCC optimize("-fwhole-program")

#pragma GCC optimize("-freorder-blocks")

#pragma GCC optimize("-fschedule-insns")

#pragma GCC optimize("inline-functions")

#pragma GCC optimize("-ftree-tail-merge")

#pragma GCC optimize("-fschedule-insns2")

#pragma GCC optimize("-fstrict-aliasing")

#pragma GCC optimize("-fstrict-overflow")

#pragma GCC optimize("-falign-functions")

#pragma GCC optimize("-fcse-skip-blocks")

#pragma GCC optimize("-fcse-follow-jumps")

#pragma GCC optimize("-fsched-interblock")

#pragma GCC optimize("-fpartial-inlining")

#pragma GCC optimize("no-stack-protector")

#pragma GCC optimize("-freorder-functions")

#pragma GCC optimize("-findirect-inlining")

#pragma GCC optimize("-fhoist-adjacent-loads")

#pragma GCC optimize("-frerun-cse-after-loop")

#pragma GCC optimize("inline-small-functions")

#pragma GCC optimize("-finline-small-functions")

#pragma GCC optimize("-ftree-switch-conversion")

#pragma GCC optimize("-foptimize-sibling-calls")

#pragma GCC optimize("-fexpensive-optimizations")

#pragma GCC optimize("-funsafe-loop-optimizations")

#pragma GCC optimize("inline-functions-called-once")

#pragma GCC optimize("-fdelete-null-pointer-checks")

#include <cstdio>

#include <iostream>

#include <algorithm>

#include <cstring>

#include <queue>

#include <cmath>

using namespace std;



int N,M,cnt;

int head[100050];

long long dis[100050];

bool vis[100050],inq[100050];

struct edge{

    int u,v,w,next;

}t[400050];

inline void add(int u,int v,int w){

    t[++cnt].u=u;

	t[cnt].v=v;

    t[cnt].w=w;

    t[cnt].next=head[u];

    head[u]=cnt;

}

queue<int>q;

inline bool spfa(int start){

    

    q.push(start);

    inq[start]=true;

    dis[start]=0;

    

    while(!q.empty()){

        int u=q.front();

        	q.pop();

        inq[u]=false;

    	

		for(int i=head[u];i;i=t[i].next){

            int v=t[i].v;

            	if(dis[v]==12345678987654321){

                	dis[v]=dis[u]+t[i].w;

                		vis[v]=true;

                	if(!inq[v])

                   		q.push(v);

            	}

            	else 

				if(dis[v]!=dis[u]+t[i].w)

                	return false;

        }

    }

    return true;

}



int main(){

	scanf("%d%d",&N,&M);

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

    	int u,v,w;

        scanf("%d%d%d",&u,&v,&w);

        add(u,v,w),add(v,u,-w);

    }

    for(int i=1;i<=N;i++)

		dis[i]=12345678987654321;

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

        if(!vis[i]){

            vis[i]=true;

            	bool flag=spfa(i);

            	if(!flag){

                	printf("No\n");

                		return 0;

            	}

        }

    }

    printf("Yes\n");

    return 0;

}