Twitter OA prepare: even sum pairs
Twitter OA prepare: even sum pairs
思路:无非就是扫描一遍记录奇数和偶数各自的个数,比如为M和N,然后就是奇数里面选两个、偶数里面选两个,答案就是M(M-1)/2 + N(N-1)/2
Twitter OA prepare: even sum pairs
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