/* HDU 6168 - Numbers [ 思维 ] | 2017 ZJUT Multi-University Training 9 题意: .... 分析: 全放入multiset 从小到大,慢慢筛 */ #include <bits/stdc++.h> using namespace std; const int N = 125250; int n, s[N]; int a[N], cnt; multiset<int> st; multiset<int>::it…

Numbers Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 514    Accepted Submission(s): 270 Problem Description zk has n numbers a1,a2,...,an. For each (i,j) satisfying 1≤i<j≤n, zk generates a…

题目链接 Problem Description zk has n numbers a1,a2,...,an. For each (i,j) satisfying 1≤i<j≤n, zk generates a new number (ai+aj). These new numbers could make up a new sequence b1,b2,...,bn(n−1)/2. LsF wants to make some trouble. While zk is sleeping, Ls…

Numbers Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5522 Description 给n个数A1,A2....An{A}_{1},{A}_{2}....{A}_{n}A​1​​,A​2​​....A​n​​,从中选3个位置不同的数A,B和C,问是否有一种情况满足A-B=C. Input There are multiple test cases, no mo…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5585 思路:对于2和5只须看最后一位数,对于三看所有位的数字之和就行 #include<stdio.h> #include<math.h> #include<stdlib.h> #include<string.h> #include<iterator> #include<iostream> #include<algorithm>…

Numbers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 460    Accepted Submission(s): 283 Problem Description There is a number N.You should output "YES" if N is a multiple of 2, 3 or 5,ot…

http://acm.hdu.edu.cn/showproblem.php?pid=5181 题意: 有一个栈,其中有n个数1~n按顺序依次进入栈顶,在某个时刻弹出. 其中m个限制,形如数字A必须在数字B之前弹出. 求方案总数   dp[i][j]表示数字i~j的出栈方案数 枚举最后一个出栈的数k,若k合法 dp[i][j]+=dp[i][k]*dp[k+1][j] 如何判断k是否合法?   对于一组i,j,k来说,它的弹出顺序是 [i,k-1]早于[k+1,j]早于k 对于一个限制 A必须在B…

Problem Description A number whose only prime factors are 2,3,5 or 7 is called a humble number. The sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 25, 27, ... shows the first 20 humble numbers. Write a program to find and pri…

Humble Numbers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 21853    Accepted Submission(s): 9553 Problem Description A number whose only prime factors are 2,3,5 or 7 is called a humble numb…

题目:http://acm.hdu.edu.cn/showproblem.php?pid=5181 题解:https://www.cnblogs.com/Miracevin/p/10960717.html 原来卡特兰数的这个问题还能区间DP…… XO #include<cstdio> #include<cstring> #include<algorithm> #define ll long long using namespace std; int rdn() { ;;…