摘要：6979 Known NotationDo you know reverse Polish notation (RPN)? It is a known notation in the area of mathematics andcomputer science. It is also known 阅读全文

摘要：B. Lucky Numbers time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Petya loves lucky numbe 阅读全文

摘要：题目： 题意：给你n个数值，要求排列这个序列使得第k个数值的前K-1个数的和>=第k个数值的个数尽可能多； 分析：贪心，从小到大遍历，如果当前能选这个数就选（使的前缀和最小），不符合的话就往后面随便排 阅读全文