POJ P2104 K-th Number

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POJ 3111 K Best（01分数规划）

K Best Time Limit: 8000MS Memory Limit: 65536K Total Submissions: 9876 Accepted: 2535 Case Time Limit: 2000MS Special Judge Description Demy has n jewels. Each of her jewels has some value vi and weight wi. Since her husband John got broke afte…

poj 3111 K Best (二分搜索之最大化平均值之01分数规划)

Description Demy has n jewels. Each of her jewels has some value vi and weight wi. Since her husband John got broke after recent financial crises, Demy has decided to sell some jewels. She has decided that she would keep k best jewels for herself. Sh…

poj 3111 K Best 最大化平均值二分思想

poj 3111 K Best 最大化平均值二分思想题目链接: http://poj.org/problem?id=3111 思路: 挑战程序竞赛书上讲的很好,下面的解释也基本来源于此书设定条件C(x):=可以选择使得单位重量的价值不小于x 如何判定C(x)是否可行假设选了某个物品的集合是S,那么单位重量的价值是:\[ \sum\limits_{i \in S} {v_i } /\sum\limits_{i \in S} {w_i } \] 因此就变成了判断是否存在S满足下面的条件:\[…

POJ - 3111 K Best 0-1分数规划二分

K Best Time Limit: 8000MS Memory Limit: 65536K Total Submissions: 12812 Accepted: 3290 Case Time Limit: 2000MS Special Judge Description Demy has n jewels. Each of her jewels has some value vi and weight wi. Since her husband John got broke aft…

【POJ】2104 K-th Number（区间k大+主席树）

http://poj.org/problem?id=2104 裸题不说.主席树水过. #include <cstdio> #include <iostream> #include <algorithm> using namespace std; #define dbg(x) cout << #x << "=" << x << endl #define read(x) x=getint() #define…

You are working for Macrohard company in data structures department. After failing your previous task about key insertion you were asked to write a new data structure that would be able to return quickly k-th order statistics in the array segment. Th…