2529. [Poi2011]Sticks
#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.
给出若干木棍，每根木棍有特定的颜色和长度。问能否找到三条颜色不同的木棍构成一个三角形。
(注意这里所说的三角形面积要严格大于0)
第一行给出一个整数k(3<=k<=50),表示颜色的种数。这k种颜色被标号为1至k。
接下来k行，第i+1描述颜色为i的木棍的信息。
首先一个整数Ni(1<=Ni<=10^6)表示颜色为i的木棍的数量。
接下来Ni个整数，表示这Ni根木棍各自的长度。
所有木棍的长度<=10^9。总木棍数量<=10^6。
你的程序应该仅输出一行
如果有解，输出6个整数，分别表示第一条边的颜色，第一条边的长度，第二条边的颜色，第二条边的长度，第三条边的颜色，第三条边的长度，这六个整数以空格分割。
如果有多组解，随便输出一组即可。
如果无解，输出 NIE
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
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