#include #define FOR(i,a,b) for (int i=(a);i<(b);i++) #define FORR(i,a,b) for (int i=(a);i>=(b);i--) #define pb push_back #define pcnt __builtin_popcount #define show(x) cout<<#x<<" = "< pii; typedef vector vi; typedef vector vvi; typedef vector vpii; typedef set si; typedef pair pll; typedef vector vl; typedef vector vvl; typedef vector vpll; typedef set sl; typedef __int128_t lll; typedef pair plll; typedef vector vlll; templatestring join(vector&v) {stringstream s;FOR(i,0,sz(v))s<<' '<b)swap(a,b);for(;a>0;b%=a,swap(a,b));return b;} int modpow(ll a,ll n,int m){if(a==0)return a;ll p=1;for(;n>0;n/=2,a=a*a%m)if(n&1)p=p*a%m;return(int)p;} void dout(double d){printf("%.12f\n",d);} const int iinf = 1e9; const ll linf = 1e18; const int mod = 1e9+7; const double pi = acos(-1); const double eps = 1e-10; int n, m, a[1000]; si s[1000]; vi v[1000]; bool kdmt(int a, int b, int c){ return a != c && (b < a && b < c || a < b && c < b); } main(){ cin.tie(0); ios::sync_with_stdio(false); cin >> n >> m; FOR(i, 0, n) cin >> a[i]; FOR(i, 0, m){ int u, w; cin >> u >> w; u--; w--; v[u].pb(w); v[w].pb(u); s[u].insert(a[w]); s[w].insert(a[u]); } FOR(i, 0, n)each(itr, v[i])each(itr2, v[*itr])if(kdmt(a[i], a[*itr], a[*itr2])){ cout << "YES\n"; return 0; } cout << "NO\n"; return 0; }