BALLOT - Distributing Ballot Boxes

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Today, besides SWERC’11, another important event is taking place in Spain which rivals it in importance: General Elections. Every single resident of the country aged 18 or over is asked to vote in order to choose representatives for the Congress of Deputies and the Senate. You do not need to worry that all judges will suddenly run away from their supervising duties, as voting is not compulsory.

The administration has a number of ballot boxes, those used in past elections. Unfortunately, the person in charge of the distribution of boxes among cities was dismissed a few months ago due to financial restraints. As a consequence, the assignment of boxes to cities and the lists of people that must vote in each of them is arguably not the best. Your task is to show how efficiently this task could have been done.

The only rule in the assignment of ballot boxes to cities is that every city must be assigned at least one box. Each person must vote in the box to which he/she has been previously assigned. Your goal is to obtain a distribution which minimizes the maximum number of people assigned to vote in one box.

In the first case of the sample input, two boxes go to the first city and the rest to the second, and exactly 100,000 people are assigned to vote in each of the (huge!) boxes in the most efficient distribution. In the second case, 1, 2, 2 and 1 ballot boxes are assigned to the cities and 1,700 people from the third city will be called to vote in each of the two boxes of their village, making these boxes the most crowded of all in the optimal assignment.


The first line of each test case contains the integers N (1 ≤ N ≤ 500,000), the number of cities, and B (NB ≤ 2,000,000), the number of ballot boxes. Each of the following N lines contains an integer ai, (1 ≤ ai ≤ 5,000,000), indicating the population of the ith city.

A single blank line will be included after each case. The last line of the input will contain -1 -1 and should not be processed.


For each case, your program should output a single integer, the maximum number of people assigned to one box in the most efficient assignment.

Sample Input

2 7

4 6

-1 -1

Sample Output


Problemsetter: Luis Hernandez Corbato

hide comments
trucoder: 2019-08-04 07:12:23

priority queue is best

sampreyo: 2019-01-15 11:25:01

binary search or priority queue both work

kushagrasri: 2019-01-07 15:14:58

AC in one go! Classic Binary Search :)
Solve AGGRCOW before doing this. Read the topcoder tutorial very carefully before attacking questions of binary search.

Rahul Raturi: 2018-08-19 04:57:50

O(nlog(max(a))) tle in python :/

Last edit: 2018-08-19 07:25:52
sherlocklives: 2018-07-02 15:54:26

O(BlogN) passes

anirudnits: 2018-06-18 21:32:05

don't trust spoj toolkit for this one.

code_aim: 2017-05-28 19:55:21

Similar to AGGRCOW.
AC in one go -:)

vengatesh15: 2017-02-05 13:42:33

Binary search :-)

ahmed Ibrahim: 2016-08-27 17:17:37

AC in first attempt , in first i solved problem (
AGGRCOW made me understand binary search very well,so above problem is so easy to solve.

SHIVEK SACKLECHA: 2015-12-29 22:31:53

Accepted in first attempt :D

Added by:David GarcĂ­a Soriano
Time limit:7.451s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ASM64
Resource:Southwestern Europe Regional, SWERC 2011