题目链接 Problem Description Alice are given an array A[1..N] with N numbers. Now Alice want to build an array B by a parameter K as following rules: Initially, the array B is empty. Consider each interval in array A. If the length of this interval is le…

Alice are given an array A[1..N] with N numbers. Now Alice want to build an array B by a parameter K as following rules: Initially, the array B is empty. Consider each interval in array A. If the length of this interval is less than K, then ignore th…

K-th Number Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 599    Accepted Submission(s): 234 Problem Description Alice are given an array A[1..N] with N numbers. Now Alice want to build an a…

Alice are given an array A[1..N]A[1..N] with NN numbers. Now Alice want to build an array BB by a parameter KK as following rules: Initially, the array B is empty. Consider each interval in array A. If the length of this interval is less than KK, the…

题目链接:https://cn.vjudge.net/problem/HDU-6231 思路:二分+双指针: #include <stdio.h> #include <iostream> #include <string.h> #include <math.h> #include <algorithm> using namespace std; typedef long long int LL; const int INF=2e9+1e8; co…

题意:给一个长度为n的数组,问在由这个数组的所有的区间第k小组成B数组中,第m大元素是多少 解法:这题较难的地方在于转化思维.如果去求所有区间的第k小,最坏复杂度是O(n*n)肯定超时. 这题正确的解法是二分一个最大的x,这个x满足有大于等于m个[区间的第k小]大于等于x.. 所以关键在于,如何求有多少个区间的第k小大于等于x. 一个区间第k小要大于等于x,则这个区间至少要有k个数大于等于x.. 我们枚举区间的左端点L.对于每个左端L,可以找一个最小的r使得,当右端点大于等于r时,[L,r]有k…

Saving HDU Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 7194    Accepted Submission(s): 3345 Problem Description 话说上回讲到海东集团面临内外交困,公司的元老也只剩下XHD夫妇二人了.显然,作为多年拼搏的商人,XHD不会坐以待毙的.  一天,当他正在苦思冥想解困良策的…

http://acm.hdu.edu.cn/showproblem.php?pid=3037 Lucas定理模板. 现在才写,noip滚粗前兆QAQ #include<cstdio> #include<cstring> #include<algorithm> using namespace std; typedef long long ll; int jc[100003]; int p; int ipow(int x, int b) { ll t = 1, w = x;…

http://acm.hdu.edu.cn/showproblem.php?pid=4859 题目大意: 在一个矩形周围都是海,这个矩形中有陆地,深海和浅海.浅海是可以填成陆地的. 求最多有多少条方格线满足两侧分别是海洋和陆地 这道题很神 首先考虑一下,什么情况下能够对答案做出贡献 就是相邻的两块不一样的时候 这样我们可以建立最小割模型,可是都说是最小割了 无法求出最大的不相同的东西 所以我们考虑转化,用总的配对数目 - 最小的相同的对数 至于最小的相同的对数怎么算呢? 我们考虑这样的构造方法:…

Special equations Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 4569 Description Let f(x) = a nx n +...+ a 1x +a 0, in which a i (0 <= i <= n) are all known integers. We call f(x) 0 (mod…