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完美立方题解.md

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四重循环枚举a,b,c,d,a在最外层,d在最里层,每一层都从小到大枚举 a的枚举范围$[2,N]$ b的枚举范围$[2,a-1]$ c的枚举范围$[b,a-1]$ d的枚举范围$[c,a-1]$