习题10-5 UVA - 1213 Sum of Different Primes 不同的素数之和(DP + 素数打表),大体题意:选择K个质数,使
///01背包,素数打表 # include <stdio.h> # include <algorithm> # include <string.h> # include <math.h> # include <iostream> using namespace std; int cot; int used[1500]; int prime[1500]; void sushu()///素数打表 { memset(used,0,sizeof(used)); cot=0; for(int i=2; i<=1120...
POJ 3132 Sum of Different Primes (DP) 题意:给定n和k,要求找出k个互不相同的素数,使其和==n,求这样的组合有多少中 思路:因为素数互不相同,自然想到了0-1背包,可是怎么背包却想了很久,因为多了一个限制:k,那么必须用两维数组来做,用dp[M][K]表示在组成M时,K个素数互不相同的情况,于是可以用0-1...
A positive integer may be expressed as a sum of different prime numbers (primes), in one way or another. Given two positive integers n and k, you should count the number of ways to express n as a sum of k different primes. Here, two ways are considered to be the same if they sum...
UVa1213 - Sum of Different Primes(素数表+DP) 题意是选择k个质数使其和为n,先搞一个素数表然后dp,dp[i][j]表示选了j个数和位i的方案数。 #include<bits/stdc++.h> usingnamespacestd; typedeflonglongll; constintmaxn=1120; boolcheck[maxn];...
Sum of Different Primes Time Limit:5000MSMemory Limit:65536K Description A positive integer may be expressed as a sum of different prime numbers (primes), in one way or another. Given two positive integersnandk, you should count the number of ways to expressnas a sum ofkdifferent primes. ...
UVA - 1213 Sum of Different Primes 素数+dp 题意: 给一个n和k,求k个素数的和为n的方案数。和0 1背包很像 A positive integer may be expressed as a sum of different prime numbers (primes), in one way oranother. Given two positive integers n and k, you should count the numb......
UVa01213_SumofDifferentPrimes.java UVa01225_DigitCounting.java UVa01226_Numericalsurprises.java UVa01230_MODEX.java UVa01235_AntiBruteForceLock.java UVa01237_ExpertEnough.java UVa01251_RepeatedSubstitutionwithSed.java UVa01260_Sales.java UVa01261_StringPopping.java UVa01262_Password.java UVa10000_LongestPat...
We could probably answer thisquestion using problem 4, but let's answer it using complex numbers instead. First off, notethat there is only 1 way to write each of the 4 primes as a sum of two squares:5= 1+413=4+9。17= 1+ 1629=4+ 25Let's start with a baby case. How many ...
Squares of primesPowers of 2Linnik’s almost Goldbach problemIn this paper, it is proved by a different method that every sufficiently large odd integer can be written as a sum of one prime, two squares of primes and 17 powers of 2, which improves the previous...