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Educational Codeforces Round 86 (Rated for Div. 2) C. Yet Another Counting Problem
時間 2020-07-21
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C. Yet Another Counting Problemc++ 題意:給兩個數a、b, 再給 q 個範圍 l、r,問在 l~r 的範圍中有多少個數x是 x % a % b != x % b % a ,輸出符合條件的數的個數web 思路:一個連續區間去模同一個數是週期性的,好比1~10 去%3 獲得的結果就是 1 2 0 1 2 0 1 2 0 1svg 因此題面給的a、b一樣具備這樣的週期性
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