第十二届蓝桥杯省赛C&C++ 研究生组-货物摆放

还是整数分解问题,注意n本身也是约数

#include <iostream>
int main(){
  printf("2430");
  return 0;
}

#include <iostream>
#include<cmath>
#include<algorithm>
using namespace std;
typedef long long ll;
const ll n = 2021041820210418LL;
const ll maxn = 44955998;
ll p[maxn] = {1};
int main(){
  ll sqr = (ll) sqrt(n), count = 0, num = 1;//126432 44955998
  for(int i = 2; i <= sqr; i++){
  	if(n % i == 0){
  		p[num++] = i;
  		if(i * i != n) p[num++] = n / i;
	  }
  }
  p[num] = n;	
  for(int i = 0; i <= num; i++){
  	for(int j = 0; j <= num; j++){
  		for(int k = 0; k <= num; k++){
  			if(p[i]*p[j]*p[k] == n) {
  				count++;
  				printf("%lld %lld %lld\n", p[i], p[j], p[k]);
			  }
		  }
	  }
  }
  printf("%lld", count);
  return 0;
}