【剑指offer】【其它算法】49.丑数

其它算法

class Solution {
public:
    int nthUglyNumber(int n) {
        vector<int> q(1, 1);
        int i = 0, j = 0, k = 0;
        while(--n)
        {
            int t = min(q[i] * 2, min(q[j] * 3, q[k] * 5));
            q.push_back(t);
            if(q[i] * 2 == t) i++;
            if(q[j] * 3 == t) j++;
            if(q[k] * 5 == t) k++; 
        }
        return q.back();
    }
};