var GET=(function(){function f(s){return new g(s);}function g(s){this._s=s.trim().split("\n");this._y=0;}g.prototype.a=function(f){var s=this._s, y=this._y, r;if(typeof s[y]==="string")s[y]=s[y].split(" ").reverse();r=s[y].pop();if(!s[y].length)this._y++;return f?r:+r;};g.prototype.l=function(f){var s=this._s[this._y++].split(" ");return f?s:s.map(a=>+a);};g.prototype.m=function(n,f){var r=this._s.slice(this._y,this._y+=n).map(a=>a.split(" "));return f?r:r.map(a=>a.map(a=>+a));};g.prototype.r=function(n,f){var r=this._s.slice(this._y,this._y+=n);return f?r:r.map(a=>+a);};return f;})();
var o=GET(require("fs").readFileSync("/dev/stdin","utf8"));
function unionFind(n){this.a=Array(n+1).fill(-1);this.w=Array(n+1).fill(0);}
unionFind.prototype={
  root:function(i){if(this.a[i]<0)return i;var r=this.root(this.a[i]);this.w[i]+=this.w[this.a[i]];return this.a[i]=r;},
  same:function(x,y){return this.root(x)===this.root(y);},
  unite:function(x,y,w){w+=this.weight(x);w-=this.weight(y);x=this.root(x);y=this.root(y);if(x===y)return false;if(this.a[x]>this.a[y]){this.a[y]+=this.a[x];this.a[x]=y;return this.w[x]=-w;}this.a[x]+=this.a[y];this.a[y]=x;return this.w[y]=w;},
  size:function(i){return -this.a[this.root(i)];},
  weight:function(i){this.root(i);return this.w[i];},
  diff:function(x,y){return this.weight(x)-this.weight(y);},
}

console.log(main());
function main(){
  var n = o.a();
  var m = o.a();
  var uf = new unionFind(n);
  for(var i = 0; i < m; i++){
    var t = o.l();
    if(uf.unite(t[0],t[1],t[2]) === false){
      if(uf.diff(t[1],t[0]) !== t[2])return "No";
    }
  }
  return "Yes";
}