topcoder srm 552 - silver__bullet - 博客园



topcoder srm 552 - silver__bullet - 博客园

　　题意：用RGB三种颜色的球摆N层的三角形，要求相邻的不同色，给出RGB的数量，问最多能摆几个

　　解法：三种颜色的数量要么是全一样，要么是两个一样，另外一个比他们多一个，于是可以分类讨论：对于数量全一样的，直接算;对于另外的，我们可以先不考虑多出来的那一个，也是正常放，然后看最后剩下的位置能不能放完所有多出来的那一个，这个可以二分。


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