#2529. [Poi2011]Sticks

题目描述

Little Johnny was given a birthday present by his grandparents. This present is a box of sticks of various lengths and colours. Johnny wonders if there are three sticks in the set he has been given that would form a triangle with different-coloured sides. Let us note that Johnny is interested in non-degenerate triangles only, i.e., those with positive area.

(注意这里所说的三角形面积要严格大于0)

输入格式

In the first line of the standard input an integer k(3<=k<=50)is given, which is the number of different colours of sticks. The colours themselves are numbered from 1 to k.
The following klines contain descriptions of the sticks of particular colours. The line no. i+1holds integers that describe the sticks of colour , separated by single spaces. The first of these numbers, Ni(1<=Ni<=10^6) denotes the number of sticks of colour . It is followed, in the same line, by Niintegers denoting the lengths of the sticks of colour . All lengths are positive and do not exceed10^9. Furthermore, the total number of all sticks does not exceed 10^6.0020
In tests worth at least 30% of the points the following holds in addition: the total number of the sticks does not exceed 250.

输出格式

Your program should print (on the first and only line of the standard output) either:
·        six integers, separated by single spaces, that describe the construction of a triangle with different-coloured sides as follows: the colour and the length of the first stick, the colour and the length of the second stick, and the colour and the length of the third stick,
·        or the word NIE (Polish for no) if no such triple of sticks exists.
If there are multiple triples of different-coloured sticks that give rise to a triangle, your program may pick one such triple arbitrarily.

样例输入

``````
4
1 42
2 6 9
3 8 4 8
1 12
``````

样例输出

``````
3 8 4 12 2 9
``````