1. 2 Keys Keyboard

先把dp的最小不走都设置为无穷大(Integer.MAX_VALUE),初始化条件:dp[0] = dp[1] = 0,状态转移方程为dp[i] = Math.min( dp[i] , dp[j] + i / j ), 1 < i < n + 1 , 1 <= j < i,且i是j的整数倍上述状态转移方程表示:如果i是j的倍数,那么i可以通过粘贴(i/j-1)次j得到,再加上一次复制操作,那么可以通过dp[j]+i/j次操作得到dp[i].

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