摘要：
The SUM problem can be formulated as follows: given four lists A, B, C, D of integer values, compute how many quadruplet (a, b, c, d ) ∈ A x B x C x D 阅读全文
摘要：
C. Hexadecimal's Numbers time limit per test 1 second memory limit per test 64 megabytes input standard input output standard output One beautiful Jul 阅读全文
摘要：
time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output time limit per test 1 second time limit p 阅读全文