#include #define VARNAME(x) #x #define show(x) cerr << #x << " = " << x << endl using namespace std; using ll = long long; using ld = long double; template vector Vec(int n, T v) { return vector(n, v); } template auto Vec(int n, Args... args) { auto val = Vec(args...); return vector(n, move(val)); } template ostream& operator<<(ostream& os, const vector& v) { os << "sz:" << v.size() << "\n["; for (const auto& p : v) { os << p << ","; } os << "]\n"; return os; } template ostream& operator<<(ostream& os, const pair& p) { os << "(" << p.first << "," << p.second << ")"; return os; } constexpr ll MOD = (ll)1e9 + 7LL; constexpr ld PI = static_cast(3.1415926535898); template constexpr T INF = numeric_limits::max() / 10; int main() { cin.tie(0); ios::sync_with_stdio(false); int N, M; cin >> N >> M; vector a(N); for (int i = 0; i < N; i++) { cin >> a[i]; } vector out(N, 0); vector in(N, 0); for (int i = 0; i < M; i++) { int u, v; cin >> u >> v; u--, v--; if (a[u] < a[v]) { out[v]++; in[u]++; } else if (a[u] > a[v]) { out[u]++; in[v]++; } } for (int i = 0; i < N; i++) { if (out[i] >= 2 or in[i] >= 2) { cout << "YES" << endl; return 0; } } cout << "NO" << endl; return 0; }