摘要:
栈(Stack) 队列(Queue) 部分和问题 题目大意:给定整数a1,a2,…,an,判断是否可以从中选出若干数,使它们的和恰好为k 限制条件: 1≤n≤20 -108≤ai≤108 -108≤k≤108 题解:深度优先搜索,从a1开始按顺序决定每个数加或不加,在全部n个数都决定后在判断它们的和 阅读全文
摘要:
Lake Counting Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 44751 Accepted: 22120 Description Due to recent rains, water has pooled in va 阅读全文