poj2739-Sum of Consecutive Prime Numbers

Posted 2020-08-09 啊嘞

题目链接 http://vjudge.net/problem/POJ-2739

 

解题思路

　　先用筛法筛出素数，然后枚举就行了。

 

代码

#include<stdio.h>
#include<string.h>
#include<math.h>
#define MAX_SIZE 10005
int primeNumber[MAX_SIZE]; 
bool judgePrime[MAX_SIZE];
int tot; 
int search(int number)
{
    int count = 0;
    for(int i=0; i<tot; i++) {
        int now = 0; int j = i;
        while(now <= number && j < tot) {
            now += primeNumber[j];
            if(now == number) { count++; break; }
            j++;
        }
    }
    return count;
}
int main()
{
    int n;
    memset(judgePrime, true, sizeof(judgePrime));
    int m = sqrt(MAX_SIZE) + 0.5;
    for(int i=2; i<m; i++) {
        if(judgePrime[i]) {
            for(int j=i*i; j<MAX_SIZE; j+=i)
                judgePrime[j] = false;
        }
    }
    for(int i=2; i<MAX_SIZE; i++) if(judgePrime[i])
        primeNumber[tot++] = i;
    scanf("%d", &n);
    while(n != 0) {
        printf("%d\n", search(n));
        scanf("%d", &n);
    }
    return 0;
}