#include <iostream>

#include <cstdio>

#include <cstring>

#include <algorithm>

using namespace std;

typedef long long ll;

const ll maxn = 200010;

const ll maxv = 50;

ll int_get() {

    ll x = 0; char c = (char)getchar(); bool f = 0;

    while(!isdigit(c)) {

        if(c == '-') f = 1;

        c = (char)getchar();

    }

    while(isdigit(c)) {

        x = x * 10 + (ll)(c - '0');

        c = (char)getchar();

    }

    if(f) x = -x;

    return x;

}

struct edge {

    ll t; edge* next;

}e[maxn * 2], *head[maxn]; ll ne = 0;

void addedge(ll f, ll t) {

    e[ne].t = t, e[ne].next = head[f], head[f] = e + ne ++;

}

ll h[maxn];

ll n, m, v[maxn], fa[maxn];

void dfs(ll x, ll pre) {

    h[x] = h[pre] + 1;  fa[x] = pre;

    for(edge* p = head[x]; p; p = p-> next) {

        if(p-> t != pre) dfs(p-> t, x);

    }

}

void read() {

    n = int_get(); m = int_get();

    for(ll i = 1; i <= n; ++ i) v[i] = int_get();

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

        ll f, t;

        f = int_get(), t = int_get();

        addedge(f, t), addedge(t, f);

    }

    dfs(1, 0);

}

ll sta[maxn], top = 0;

void sov() {

    while(m --) {

        ll opt = int_get();

        if(!opt) {

            ll a = int_get(), b = int_get();

            top = 0;

            if(h[a] < h[b]) swap(a, b);

            while(h[a] != h[b] && top <= maxv) sta[++ top] = v[a], a = fa[a];

            if(a != b) {

                while(a != b && top <= maxv) sta[++ top] = v[a], sta[++ top] = v[b], a = fa[a], b = fa[b];

            }

            sta[++ top] = v[a];

            if(top >= maxv) {

                printf("Y\n"); continue;

            }

            sort(sta + 1, sta + top + 1); bool f = 0;

            for(ll i = 1; i < top - 1 && !f; ++ i) {

                if(sta[i] + sta[i + 1] > sta[i + 2]) f = 1;

            }

            if(f) printf("Y\n");

            else printf("N\n");

        }

        else {

            ll p = int_get(), w = int_get();

            v[p] = w;

        }

    }

}

int main() {

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

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

    read(), sov();

    return 0;

}