Codeforces403D - Beautiful Pairs of Numbers - 组合数学、dp
D. Beautiful Pairs of Numbers 分类: combinatorics dpDescription定义这一类数对 (a1,b1),(a2,b2),⋯,(ak,bk)(a1,b1),(a2,b2),⋯,(ak,bk)(a_1,b_1),(a_2,b_2),\cdots,(a_k,b_k) 是美丽的,当它满足:1≤a1≤b1<a2≤b2<⋯&...