HDU4000 Fruit Ninja利用树状数组计数+组合数学

http://acm.hdu.edu.cn/showproblem.php?pid=4000 让找i<j<k,但是ai<ak<aj的数 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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