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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