3.8-15

贪心:
P1090 合并果子 / [USACO06NOV]Fence Repair G
P1181 数列分段Section I
P1208 [USACO1.3]混合牛奶 Mixing Milk
P1223 排队接水
P1094 纪念品分组
P1803 凌乱的yyy / 线段覆盖
P1031 均分纸牌
P1080 国王游戏

Educational Codeforces Round 83 (Rated for Div. 2):
A Two Regular Polygons 计算几何
B Bogosort 思维
C Adding Powers 数论