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

#include <cstdio>

#include <cstring>

#include <algorithm>

#include <queue>

#include <vector>

#include <cmath>

#define LL long long

using namespace std;

const int MOD=1e9+7;

const int INF=0x3f3f3f3f;

const int M=200100;

const int N=100100;

inline void read(int &x){

	x=0;int mm=1; char ch=getchar();

	while((ch>'9'||ch<'0')&&ch!='-') ch=getchar();

	if(ch=='-') mm=-1,ch=getchar();

	while(ch>='0'&&ch<='9') x=(x<<3)+(x<<1)+ch-'0',ch=getchar();

	x=x*mm;

}

inline void read(LL &x){

	x=0;LL mm=1; char ch=getchar();

	while((ch>'9'||ch<'0')&&ch!='-') ch=getchar();

	if(ch=='-') mm=-1,ch=getchar();

	while(ch>='0'&&ch<='9') x=(x<<3)+(x<<1)+ch-'0',ch=getchar();

	x=x*mm;

}

struct Edge{

	int nxt;

	int v,w;

}edge[M<<2];

int head[N],tot;

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

	edge[++tot].nxt=head[u];

	edge[tot].v=v;

	edge[tot].w=w;

	head[u]=tot;

}

int n,m;

int dist[N];

bool visited[N],inque[N];

queue <int> q;

bool SPFA(int beginn){

	visited[beginn]=true;

	inque[beginn]=true;

	dist[beginn]=0;

	q.push(beginn);

	int maxx=0,minn=0;

	while(!q.empty()){

		int u=q.front();q.pop();

		inque[u]=false;

		for(int i=head[u];i;i=edge[i].nxt){

			Edge &e=edge[i];

			if(dist[e.v]<INF){

				if(dist[e.v]!=e.w+dist[u]){

					return false;

				}

			}else{

				dist[e.v]=e.w+dist[u];

				maxx=max(maxx,dist[e.v]);

				minn=min(minn,dist[e.v]);

				if(maxx-minn>INF) return false;

				visited[e.v]=true;

				if(!inque[e.v]){

					inque[e.v]=true;

					q.push(e.v);

				}

			}

		}

	}

	return true;

}

int main(){

	read(n),read(m);

	memset(head,0,sizeof(head));

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

		int u,v,w;

		read(u),read(v),read(w);

		add(u,v,w);

		add(v,u,-w);

	}

	memset(dist,INF,sizeof(dist));

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

		if(!visited[i])

			if(!SPFA(i)){

				printf("No");

				return 0;

			}

	}

	printf("Yes");

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.802007694177496x):
#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;

}