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C. Serval and Parenthesis Sequence time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Serval soon said goodbye to Japari kindergarten...

D. Serval and Rooted Tree time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Now Serval is a junior high school student in Japari Mi...

​​http://codeforces.com/contest/1195 A. Drinks Choosing 题目： n个人，k种饮料，第i个人想喝第a_i种饮料。提供任意饮料套餐，一个饮料套餐必定含有相同的两份饮料。取ceil(n/2)份饮料套餐，问最多有多少人能喝到自己想喝的饮料 对a数组排序后，统计有多少对（k,k）相同数字可以喝同一份套餐，记为cnt1，其余不能组成对的...