自然数ã®é›†åˆ S ã«å¯¾ã—ã¦ï¼Œé›†åˆ \{ GCD(T) | T ⊆ S, T ã¯ç©ºã§ãªã„ \} ã®è¦ç´ æ•°ã‚’ f(S) ã¨ãŠã.
ã“ã“ã§ï¼ŒGCD(T) 㯠T ã«å«ã¾ã‚Œã‚‹ã™ã¹ã¦ã®æ•°ã‚’割り切るよã†ãªæœ€å¤§ã®æ•´æ•°ã§ã‚る.
特ã«ï¼ŒT ãŒä¸€ã¤ã®æ•´æ•° a ã®ã¿ã‹ã‚‰ãªã‚‹ã¨ã㯠GCD(\{a\}) = a ã§ã‚ã‚‹ã“ã¨ã«æ³¨æ„ã›ã‚ˆï¼Ž
i = 1, 2, . . ., N - W+1 ã«å¯¾ã—㦠f(\{i, i+1, . . ., i+W - 1\}) を求ã‚よ.
入力ã¯ä»¥ä¸‹ã®å½¢å¼ã«å¾“ã†ï¼Žä¸Žãˆã‚‰ã‚Œã‚‹æ•°ã¯å…¨ã¦æ•´æ•°ã§ã‚る.
N W
i = 1, 2, . . ., N-W+1 ã®ã¨ãã® f(\{i, i+1, . . ., i+W-1\}) ã®å€¤ã‚’åŠè§’スペース区切り㧠1 è¡Œã«å‡ºåŠ›ã›ã‚ˆï¼Ž
10 2
2 3 3 3 3 3 3 3 3
GCD(\{1\}) = 1, GCD(\{2\}) = 2, GCD(\{1,2\}) = 1 ã¨ãªã‚‹ã‹ã‚‰ f(\{1,2\}) = 2 ã§ã‚る.
30 7
7 8 9 10 10 11 11 11 11 12 11 12 10 12 12 11 10 12 12 12 10 11 11 13