2019

    AtCoder-5633 Counting of Trees

    At first I didn't understand the meaning of the problem. It means 1 is the root and the distance between the points on the first layer with the root is 1.

    AtCoder-5039 AB Substrings

    This is to find how many strings that starts with A and ends with B and the number of AB inside the string.

    AtCoder-4871 Lower

    The max number = max(max number, answer).

    AtCoder-4870 Attack Survival

    The main mission of this problem is to count each players number of right questions.

    AtCoder-4297 Monsters Battle Royale

    Seeing the operation, we can easily think of Euclidean algorithm which is the way to calculate GCD.

    AtCoder-4873 ModSum

    The biggest answer is that after the operation the number can remain it self.

    AtCoder-5037 Consecutive Integers

    If you have three numbers 1, 2, 3 and want the length of the consecutive subsequence be two, the answer is 3-2+1, because you can choose 1, 2 or 1, 3.

    Calculator (double stack)

    The pre-knowledges you should know is priority of operator. Priority is the rule that determines when we meet two operators, which to calculate first. Like 3+2*5, we calculate 2 * 5 first.

    The priority of operators are:

    String HDU-6572

    Because of selecting the same character is allowed, so the probability of one character is

    Traffic HDU-6573

    There is a fuzzy point in the description. That is all the car has to wait the same amount of time. For example,


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