[Algo]零一背包1.夏季特惠//1.夏季特惠//https://leetcode.cn/problems/tJau2o/description/longmaxHappyValue(vector<long>&a,vector<long>&b,vector<long>&w,longx){//a:原价数组,b:现价数组,w:快乐值数组,x:预算longn=a.size()