added timus 1225
added timus 1876
added timus 1893
added eolimp 22
added eolimp 5335
added eolimp 5318
added eolimp 5319
added eolimp 5320
added eolimp 5321
added eolimp 5322
added eolimp 5325
added eolimp 5328
added eolimp 5337
added usaco friday