枚 举1-1完美立方

例题1：完美立方

请按照a的值，从小到大依次输出。当两个完美立方
等式中a的值相同，则b值小的优先输出、仍相同
则c值小的优先输出、再相同则d值小的先输出。

 样例输入
24
7
完美立方
 样例输出
Cube = 6, Triple = (3,4,5)
Cube = 12, Triple = (6,8,10) 
Cube = 18, Triple = (2,12,16) 
Cube = 18, Triple = (9,12,15) 
Cube = 19, Triple = (3,10,18)
Cube = 20, Triple = (7,14,17) 
Cube = 24, Triple = (12,16,20)

解题思路

四重循环枚举a,b,c,d ，a在最外层，d在最里层，每一层
都是从小到大枚举，
a枚举范围[2,N]
b范围 [2,a-1]
c范围 [b,a-1]
d范围 [c,a-1]
代码

#include<iostream>
#include<cmath>
using namespace std;

int main() {
  int N = 0;
  cin >> N;
  for (int a = 2; a <= N; a++) 
    for(int b = 2; b < a ; b++)
      for(int c=b;c<a;c++)
        for (int d = c; d < a; d++) {
          if(pow((double)a,3)== pow((double)b, 3)+ pow((double)c, 3)+ pow((double)d, 3))
            printf("Cube = %d, Triple = (%d,%d,%d)\n", a, b, c,d);
            
        }
  

  return 0;
}