SGU Volume 2
- SGU200.Cracking RSA------------------------★高斯消元
- SGU207.Robbers -------------------------------数论
- SGU218.Unstable Systems-------------------★图论、二分
- SGU220.LittleBishops-------------------------★★ DP
- SGU221.BigBishops---------------------------★★ DP
- SGU222.Little Rooks--------------------------DP
- SGU223.LittleKings----------------------------★★ 状态压缩DP
- SGU224.LittleQueens--------------------------★★ 搜索 DP
- SGU226.Coloredgraph-------------------------★ 图
- SGU230.Weighings-----------------------------图
- SGU239.Minesweeper--------------------------枚举
- SGU231.Prime Sum----------------------------- 简单数论
- SGU246.Black&White---------------------------★ 分析，数论
- SGU249.Matrix----------------------------------★ Gray码
- SGU260.Puzzle----------------------------------★高斯消元
- SGU269.Rooks----------------------------------DP
- SGU274. Spam-filter----------------------------模拟
- SGU275.To xor or not to xor-------------------★★★高斯消元
- SGU276.Andrew's Troubles--------------------简单题
- SGU280.Trade centers--------------------------★★★贪心
- SGU281.Championship-------------------------贪心
- SGU296.Sasha vs. Kate--------------------------贪心
- SGU299.Triangle---------------------------------简单题
