题解 | #质数因子#

#include<stdio.h>
#include<math.h>
int main(void) {
    int a, b;
    scanf("%d", &a);
    for (b = 2; b <= a; b++) {
        if (b > sqrt(a) + 1) {
            b = a;
            printf("%d", b);
            break;
        }
        while (a % b == 0) {
            printf("%d ", b);
            a /= b;
        }
    }
    return 0;
}