一开始是往二分上去想的,如果risk是x,题目要求则可以转化为一个不等式,Si + x >= sigma Wj ,j表示安排在i号牛上面的牛的编号. 如果考虑最下面的牛那么就可以写成 Si + x ≥ sum W - Wi,为了方便处理把i号牛的信息合并到一起 → Si + Wi + x ≥sum W. 二分x的时候,x是个常量,而从下面往上去安排牛的时候,下面的牛是没有影响决策的,可以看成把Wi去掉. 于是得到一个贪心的选法,把牛按照Si+Wi排序,从下面往上安排牛,可选择的牛应该满足Si+…
Description Farmer John's N (1 <= N <= 50,000) cows (numbered 1..N) are planning to run away and join the circus. Their hoofed feet prevent them from tightrope walking and swinging from the trapeze (and their last attempt at firing a cow out of a ca…
Description Farmer John's N (1 <= N <= 50,000) cows (numbered 1..N) are planning to run away and join the circus. Their hoofed feet prevent them from tightrope walking and swinging from the trapeze (and their last attempt at firing a cow out of a ca…
Cow Acrobats Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 3686 Accepted: 1428 Description Farmer John's N (1 <= N <= 50,000) cows (numbered 1..N) are planning to run away and join the circus. Their hoofed feet prevent them from tig…
Best Cow Line Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 42701 Accepted: 10911 Description FJ is about to take his N (1 ≤ N ≤ 2,000) cows to the annual"Farmer of the Year" competition. In this contest every farmer arranges hi…
传送门:http://poj.org/problem?id=1017 Packets Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 59106 Accepted: 20072 Description A factory produces products packed in square packets of the same height h and of the sizes 1*1, 2*2, 3*3, 4*4, 5*5…
题目链接:http://poj.org/problem?id=3045 Cow Acrobats Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 5713 Accepted: 2151 Description Farmer John's N (1 <= N <= 50,000) cows (numbered 1..N) are planning to run away and join the circus. The…
Cow Acrobats Time Limit: 1000MS Memory Limit: 65536KB 64bit IO Format: %I64d & %I64u Submit Status Description Farmer John's N (1 <= N <= 50,000) cows (numbered 1..N) are planning to run away and join the circus. Their hoofed feet prevent th…
POJ 3190 Stall Reservations贪心 Description Oh those picky N (1 <= N <= 50,000) cows! They are so picky that each one will only be milked over some precise time interval A..B (1 <= A <= B <= 1,000,000), which includes both times A and B. Obvi…
Cow Acrobats Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 4998 Accepted: 1892 Description Farmer John's N (1 <= N <= 50,000) cows (numbered 1..N) are planning to run away and join the circus. Their hoofed feet prevent them from tig…
Cow Acrobats Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 6253 Accepted: 2345 Description Farmer John's N (1 <= N <= 50,000) cows (numbered 1..N) are planning to run away and join the circus. Their hoofed feet prevent them from tightro…
Cow Acrobats Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 2302 Accepted: 912 Description Farmer John's N (1 <= N <= 50,000) cows (numbered 1..N) are planning to run away and join the circus. Their hoofed feet prevent them from tigh…
1629: [Usaco2007 Demo]Cow Acrobats Time Limit: 5 Sec Memory Limit: 64 MBSubmit: 601 Solved: 305[Submit][Status] Description Farmer John's N (1 <= N <= 50,000) cows (numbered 1..N) are planning to run away and join the circus. Their hoofed feet pre…
Cows Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 8122 Accepted: 3674 Description Your friend to the south is interested in building fences and turning plowshares into swords. In order to help with his overseas adventure, they are f…
POJ 3660 Cow Contest / HUST 1037 Cow Contest / HRBUST 1018 Cow Contest(图论,传递闭包) Description N (1 ≤ N ≤ 100) cows, conveniently numbered 1..N, are participating in a programming contest. As we all know, some cows code better than others. Each cow has…
Wilbur and Array Time Limit: 2000MS Memory Limit: 262144KB 64bit IO Format: %I64d & %I64u Submit Status Description Wilbur the pig is tinkering with arrays again. He has the array a1, a2, ..., an initially consisting of n zeros. At one step, he c…
