北京大学ACM/ICPC竞赛训练暑期课数学问题专项练习

Problem ID	Title
1222 Problem A	EXTENDED LIGHTS OUT
1286 Problem B	Necklace of Beads
2142 Problem C	The Balance
2429 Problem D	GCD & LCM Inverse
2478 Problem E	Farey Sequence
2689 Problem F	Prime Distance
2891 Problem G	Strange Way to Express Integers
2960 Problem H	S-Nim
3101 Problem I	Astronomy
3270 Problem J	Cow Sorting
3696 Problem K	The Luckiest number
3707 Problem L	High-Dimensional Vector Correspondence