CLOPPAIR - Closest Point Pair

You are given N points on a plane and your task is to find a pair of points with the smallest euclidean distance between them.

All points will be unique and there is only one pair with the smallest distance.


First line of input will contain N (2<=N<=50000) and then N lines follow each line contains two integers giving the X and Y coordinate of the point. Absolute value of X,Y will be atmost 10^6.


Output 3 numbers a b c, where a,b (a<b) are the indexes (0 based) of the point pair in the input and c is the distance between them. Round c to 6 decimal digits.

See samples for more clarification.


0 0
0 1
100 45
2 3
9 9


0 1 1.000000
0 0
-4 1
-7 -2
4 5
1 1


0 4 1.414214

hide comments
bruceoutdoors: 2017-08-19 17:29:35

omg guys. I managed to get past test case 12. So what happened was that my solution was correct, but because I used cout with setprecision(7), it displayed the wrong answer for some reason. So if you want to pass this challenge, use printf

update: lol I realized I need to use fixed with setprecision to get it to the right decimal places.

cout << setprecision(6) << fixed << distance;

Last edit: 2017-08-19 17:34:00
AAKASH TYAGI: 2016-12-30 21:10:00

Remember to print the smaller index first

abhishekrahul: 2016-12-17 15:54:49

can anyone provide me fully accepted code for this question ,, i am trying it from two days but always getting wa near test case 12 ....

anshal dwivedi: 2016-03-23 09:39:42

Use long long int: ) , using double caused me 4 WA on test case 12 ;(

kr1996: 2016-01-19 21:48:24

12th case WA is probably because of the (a<b) condition

Sudharsansai: 2016-01-07 15:07:09

Don't use long long...May get WA becoz of that.Use double.Comparisons are not that strict !! Attention to (a<b) in output .( WA becoz of that -_-) .
Can use SPOJ TOOLKIT to get test cases. But some solutions there, are wrong ( Verified using my Brute Force checker) . But those solutions are accepted here. Wish to know whether the test cases here are weak ??

Last edit: 2016-01-07 15:07:37
shef: 2015-07-30 16:40:09

Did anyone identify what are we getting WA on 12th case even after using long long int

TP: 2015-07-02 17:33:04

Getting WA did n't understand why this is happening ? Only after the 12th case it shows wrong answer?

Last edit: 2015-07-02 21:37:44
Dewang Sultania: 2015-06-23 07:41:17

getting WA12 even after using long long int can any1 pls find the mistake

sHaShAnK sHeKhAr: 2015-06-22 07:41:25

Use long long int :)

Added by:SALVO
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ASM64
Resource:Standard Problem