Solution: Let us represent the string to c. First, we can notice that: for i<j, there must be $c_{s[i]}\leq c_{s[j]}$. For example, $[3,2,4,1,0,5,6]$, at least we have $c_3\leq c_2\leq c_4\leq c_1\leq c_0\leq c_5\leq c_6$.…
A. Mean Inequality Solution: Sort the array. And split the array to two parts. Each time, we take one number from each of the two parts at a time.…
Solution: First, if there are not any limitations, we will drink all the potions. In fact, the only limitation is the health must not less than 0.…
Solution: Let consider how Anton fix the DNS. We found that: for minimum cost, every time, Anton just fixing one character. For example, fix NNOTA to ANTON.…
A. Eshag Loves Big Arrays Solution: Because can choose any subsequence. So, for some number x which is bigger than the minimum number of the array.…
Solution: The first conclusion is: for any vertex, it will choose l or r. Because if and only if the case like example 2 can choose value between l and r…
Solution: Define dp[i] to represent the answer when n=i. We use the case n=4 to explain the solution.…
Solution: Use the node 0 as the root of tree. For each node, calculate the total number of children nodes (include itself) by DFS. Denote by "count".…
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