pat1057 stack

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超时算法,利用2的特殊性,用2个multiset来维护.单个multiset维护没法立即找到中位数. 其实也可以只用1个multiset,用一个中位指针,++,--来维护中位数. #include<iostream> #include<stdio.h> #include<math.h> #include<string.h> #include<stdlib.h> #include<algorithm> #include<queue…

pat1057. Stack (30)

1057. Stack (30) 时间限制 100 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Stack is one of the most fundamental data structures, which is based on the principle of Last In First Out (LIFO). The basic operations include Push (inserting an el…

PAT1057 Stack（树状数组+倍增）

目录题目大意题目分析题目大意要求维护一个栈,提供压栈.弹栈以及求栈内中位数的操作(当栈内元素\(n\)为偶数时,只是求第\(n/2\)个元素而非中间两数的平均值).最多操作100000次,压栈的数字\(key\)范围是[1,100000]. 题目分析前两个操作用\(stack\)就好. 求中位数.暴力做法即使用上优先队列也是稳稳的超时.考虑树状数组. 压栈时,将\(key\)值对应的位置加1.弹栈减1. 求中位数,可以二分求出\(sum[1:p]==(n+1)/2\)最小的\(p\),…

PAT1057 stack(分块思想)

1057 Stack (30分) Stack is one of the most fundamental data structures, which is based on the principle of Last In First Out (LIFO). The basic operations include Push (inserting an element onto the top position) and Pop (deleting the top element). N…

PAT-1057 Stack （树状数组 + 二分查找）

1057. Stack Stack is one of the most fundamental data structures, which is based on the principle of Last In First Out (LIFO). The basic operations include Push (inserting an element onto the top position) and Pop (deleting the top element). Now you…

PAT甲级1057. Stack

PAT甲级1057. Stack 题意: 堆栈是最基础的数据结构之一,它基于"先进先出"(LIFO)的原理.基本操作包括Push(将元素插入顶部位置)和Pop(删除顶部元素).现在你应该实现一个额外的操作堆栈:PeekMedian - 返回堆栈中所有元素的中间值.对于N个元素,如果N是偶数,则将中值定义为(N / 2)个最小元素,或者如果N是奇数则将其定义为((N + 1)/ 2). 输入规格: 每个输入文件包含一个测试用例.对于每种情况,第一行包含正整数N(<= 105).然后…

线性数据结构之栈——Stack

Linear data structures linear structures can be thought of as having two ends, whose items are ordered on how they are added or removed. What distinguishes one linear structure from another is the way in which items are added and removed, in particul…