Formula Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1204    Accepted Submission(s): 415 Problem Description f(n)=(∏i=1nin−i+1)%1000000007You are expected to write a program to calculate f(n)…

HDU 5862 Counting Intersections(离散化+树状数组) 题目链接http://acm.split.hdu.edu.cn/showproblem.php?pid=5862 Description Given some segments which are paralleled to the coordinate axis. You need to count the number of their intersection. The input data guarant…

Coder Time Limit: 20000/10000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4838    Accepted Submission(s): 1853 Problem Description In mathematics and computer science, an algorithm describes a set of procedures…

Queue-jumpers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3139    Accepted Submission(s): 848 Problem Description Ponyo and Garfield are waiting outside the box-office for their favorite mo…

题意:给一个数组,每次询问输出在区间[L,R]之间小于H的数字的个数. 此题可以使用划分树在线解决. 划分树可以快速查询区间第K小个数字.逆向思考,判断小于H的最大的一个数字是区间第几小数,即是答案.这一步可以使用二分搜索上界.时间复杂度是O(logn*logn). #include <iostream> #include <cstdio> #include <cstring> #include <stack> #include <algorithm&…

题意略. 离线处理,离散化.然后就是简单的线段树了.需要根据mod 5的值来维护.具体看代码了. /* 线段树+离散化+离线处理 */ #include <cstdio> #include <cstring> #include <algorithm> #include <cmath> using namespace std; typedef long long ll; #define N 100010 ll sum[N<<2][5]; int a…

Revenge of kNN Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 584    Accepted Submission(s): 136 Problem Description In pattern recognition, the k-Nearest Neighbors algorithm (or k-NN for short…

题意就不说了,求公式. 解法: 稍加推导能够得出 : f(n) = n! * f(n-1) , 即其实是求: ∏(n!)  ,盲目地存下来是不行的,这时候看见条件: 数据组数 <= 100000, 那么我们可以离线做,先把他们存下来,然后再从小到大扫一边, 也就是最多10000000次乘法的复杂度.然后离线输出即可. 代码: #include <iostream> #include <cstdio> #include <cstring> #include <…

此题可以找到规律f(n) = 1! * 2! *...*n!, 如果直接打表的话,由于n比较大(10000000),所以会超内存,这时候就要用到离线处理数据,就是先把数据存起来,到最后在暴力一遍求解就行了,代码如下 代码一(超内存): #include <stdio.h> ; ; long long a[N]; int main() { a[] = a[] = ; ; i < N; i++) { a[i] = a[i - ] * i % mod; } ; i < N; i++) {…

题目大意:给你一个长度为n的数组,问[L,R]之间<=val的个数 思路:就像标题说的那样就行了.树状数组不一定是离散化以后的区间,而可以是id //看看会不会爆int!数组会不会少了一维! //取物问题一定要小心先手胜利的条件 #include <bits/stdc++.h> using namespace std; #define LL long long #define ALL(a) a.begin(), a.end() #define pb push_back #define m…