import java.util.*
import kotlin.*

import java.io.InputStream
import java.lang.NumberFormatException
import java.lang.StringBuilder


fun main(args: Array<String>) {
    Program().solve()
}

class Program {
    fun solve() {
        val sc = FastScanner()
        val n = sc.nextInt()
        val m = sc.nextInt()
        val ls = Array(n) { mutableListOf<S>() }
        for (i in 0 until m) {
            val l = sc.nextInt() - 1
            val r = sc.nextInt() - 1
            val d = sc.nextInt()
            ls[l].add(S(r, d))
            ls[r].add(S(l, -d))
        }

        val f = Array(n){false}
        val p = Array<Int>(n) { 0 }
        for (i in 0 until n) {
            if (f[i]) continue
            val q = ArrayDeque<Int>()
            q.add(i)
            p[i] = 0
            f[i] = true
            while (q.size > 0) {
                val po = q.poll()!!
                for (j in ls[po].indices) {
                    val to = ls[po][j]
                    //println("${po} ${to.r} ${to.d}")
                    if (f[to.r]) {
                        if (p[to.r] != p[po] + to.d) {
                            //println("$po ${to.r} ${to.d}")
                            //println(p.joinToString(" "))
                            // println(f.joinToString(" "))
                            println("No")
                            return
                        }
                    } else {
                        q.add(to.r)
                        p[to.r] = p[po] + to.d
                        f[to.r] = true
                    }
                }
            }
        }
        
        println("Yes")
    }
}

data class S(val r: Int, val d: Int)

class FastScanner {
    companion object {
        val input: InputStream = System.`in`
        val buffer = ByteArray(1024) { 0 }
        fun isPrintableChar(c: Int): Boolean = c in 33..126
    }

    var ptr = 0
    var buflen = 0
    private fun hasNextByte(): Boolean {
        if (ptr < buflen) {
            return true
        } else {
            ptr = 0
            buflen = input.read(buffer)
            if (buflen <= 0) {
                return false
            }
        }
        return true
    }

    private fun readByte(): Int = if (hasNextByte()) buffer[ptr++].toInt() else -1

    private fun skipUnprintable() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr].toInt())) ptr++
    }

    fun hasNext(): Boolean {
        skipUnprintable()
        return hasNextByte()
    }

    fun next(): String {
        if (!hasNext()) throw NoSuchElementException()
        val sb = StringBuilder()
        var b = readByte()
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b)
            b = readByte()
        }
        return sb.toString()
    }

    fun nextInt(): Int {
        if (!hasNext()) throw NoSuchElementException()
        var n = 0
        var b = readByte()
        // '-' = 45
        val minus = b == 45
        if (minus) {
            b = readByte()
        }

        // '0' = 48 '9' = 57
        if (b !in 48..57) {
            throw NumberFormatException()
        }

        while (true) {
            if (b in 48..57) {
                n *= 10
                n += b - 48
            } else if (b == -1 || !isPrintableChar(b)) {
                return if (minus) -n else n
            } else {
                throw NumberFormatException()
            }
            b = readByte()
        }
    }

    fun nextLong(): Long {
        if (!hasNext()) throw NoSuchElementException()
        var n = 0L
        var b = readByte()
        // '-' = 45
        val minus = b == 45
        if (minus) {
            b = readByte()
        }

        // '0' = 48 '9' = 57
        if (b !in 48..57) {
            throw NumberFormatException()
        }

        while (true) {
            if (b in 48..57) {
                n *= 10
                n += b - 48
            } else if (b == -1 || !isPrintableChar(b)) {
                return if (minus) -n else n
            } else {
                throw NumberFormatException()
            }
            b = readByte()
        }
    }

    fun nextDouble(): Double = next().toDouble()
}


Measured memory_bytes: 66940