from math import sqrt, isclose

loi = [False, False, True, True]
phu = {
    "S1": [True, True, True, True],
    "S2": [False, False, True, True],
    "S3": [True, False, True, False],
}

def ochiai(da_chay):
    ef = sum(f and r for f, r in zip(loi, da_chay, strict=True))
    ep = sum(not f and r for f, r in zip(loi, da_chay, strict=True))
    tong_loi = sum(loi)
    mau = sqrt(tong_loi * (ef + ep))
    return ef / mau if mau else 0

diem = {dong: ochiai(cot) for dong, cot in phu.items()}
assert isclose(diem["S1"], 1 / sqrt(2))
assert diem["S2"] == 1
assert diem["S3"] == 0.5
thu_tu = sorted(diem, key=lambda dong: (-diem[dong], dong))
assert thu_tu == ["S2", "S1", "S3"]
print([(dong, round(diem[dong], 3)) for dong in thu_tu])