HZNUOJ

Pairsumonious Numbers

Tags:
Time Limit:  1 s      Memory Limit:   128 MB
Submission:2     AC:1     Score:99.94

Description

Problem B: Pairsumonious Numbers

For 10 > N > 2 numbers we form N*(N-1)/2 sums by adding every pair of the numbers. Your task is to find the N numbers given the sums. Each line of input contains N followed by N*(N-1)/2 integer numbers separated by a space. For each line of input, output one line containing N integers in non-descending order such that the input numbers are pairwise sums of the N numbers. If there is more than one solution, any one will do; if there is no solution, print "Impossible".

Samples

input
3 1269 1160 1663 3 1 1 1 5 226 223 225 224 227 229 228 226 225 227 5 216 210 204 212 220 214 222 208 216 210 5 -1 0 -1 -2 1 0 -1 1 0 -1 5 79950 79936 79942 79962 79954 79972 79960 79968 79924 79932
output
383 777 886 Impossible 111 112 113 114 115 101 103 107 109 113 -1 -1 0 0 1 39953 39971 39979 39983 39989