import Control.Applicative
import Control.Monad

main :: IO ()
main = do
  [_, m] <- f
  solve <$> replicateM m f >>= putStrLn
  where
    f = map read <$> words <$> getLine

solve :: [[Int]] -> String
solve = maybe "No" (const "Yes") . foldl f (Just (0, 0))
  where
    f tp [ti, pi] = do
      (tn, pn) <- tp
      guard $ (ti - tn) >= abs (pi - pn)
      return (ti, pi)