hdu 1240 Asteroids! (bfs)
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codeforces #323 div 2 C. GCD Table (暴力？)
C. GCD Table
time limit per test
2 seconds
memory limit per test
256 megabytes
input
standard input
output
standard output
The GCD table G of size n × n for an array of positive integers a of length n is defined by formula