[topcoder]PackingBallsDiv2

http://community.topcoder.com/stat?c=problem_statement&pm=12995

简单题

class PackingBallsDiv2 {

public:

	int minPacks(int R, int G, int B) {

		int sum = 0;

		sum += (R / 3);

		sum += (G / 3);

		sum += (B / 3);

		R %= 3;

		G %= 3;

		B %= 3;

		while ((R > 0 || G > 0 || B > 0)) {

			sum++;

			R--;

			G--;

			B--;

		}

		return sum;

	}

};