How can the king use a scale only once to figure out who's lying? 100 Dwarfs riddle.?

DwarvesRiddle

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There's 100 dwarfs and their king. everyday, the 100 dwarfs bring their king 100g of gold each. One day, the king hears a rumor that one of his minions is actually only giving him 99g, and keeping 1g from himself. The king has a scale that will tell him their weight, exactly and perfectly, one time. How can he tell who is only giving him 99g?

(ps: he can't just pile all the gold on and take them off one at a time, or put them all one one at a time, the weight is only read once).
 
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