function add(idx1, idx2)
    local node1, node2 = nodes[idx1], nodes[idx2]
    local val1, val2 = node1["val"], node2["val"]
    local cnt = node1["count"]
    if(val1 == val2) then return false end
    if(1 <= cnt and val2 == nodes[node1[1]]["val"]) then return false end
    if(2 <= cnt and val2 == nodes[node1[2]]["val"]) then return false end
    if(cnt == 2) then return true end
    if(cnt == 1) then node1[2], node1["count"] = idx2, 2 else node1[1], node1["count"] = idx2, 1 end
    return false
end

n, m = io.read("*n", "*n")
nodes = {}
for i = 1, n do
    t = {}
    t["val"] = io.read("*n")
    t["count"] = 0
    nodes[i] = t
end
found = false
for i = 1, m do
    a, b = io.read("*n", "*n")
    found = add(a, b)
    if(found) then break end
    found = add(b, a)
    if(found) then break end
end
if(not found) then
    for i = 1, n do
        t = nodes[i]
        cnt = t["count"]
        if(t["count"] == 2) then
            v = t["val"]
            v1t, v2t = nodes[t[1]], nodes[t[2]]
            v1, v2 = v1t["val"], v2t["val"]
            if(((v1 < v and v2 < v) or (v < v1 and v < v2)) and (v1 ~= v2)) then
                found = true
                break
            end
        end
    end
end
print (found and "YES" or "NO")