剑指 Offer 14- II. 剪绳子 II

原题链接：剑指 Offer 14- II. 剪绳子 II

 solution:

        贪心

const int mod = 1000000007;
class Solution {
public:
    int cuttingRope(int n) {
        if(n <= 3) return n - 1;

        long res = 1;
        while(n > 4){
            res *= 3;
            res = res % mod;
            n -= 3;
        }
        return (int)(res * n % mod);
    }
};