HDU4000 Fruit Ninja利用樹狀數組計數+組合數學

http://acm.hdu.edu.cn/showproblem.php?pid=4000 讓找i<j<k,但是ai<ak<aj的數 Problem Description Recently, dobby is addicted in the Fruit Ninja. As you know, dobby is a free elf, so unlike other elves, he coul

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