题解 | #尼科彻斯定理#

#include <math.h>
#include <stdio.h>
#include <string.h>

int main() {
    int n, num;
    scanf("%d", &n);
    if (n>=1 && n<= 100){
    num = pow(n, 3);

    int arr[n];
    int x = 0;
    
    for (int i = 0; i < n; i++) {
        x += 2 * i;

    }

    for (int i = 0; i < n; i++) {
        arr[i] = 2 * i + (num - x) / n;
    }

    char str[1000] = {0};
    int j = 0;
    sprintf(str, "%d", arr[0]);//将arr[0]以十进制写入str
    for (int i = 1; i < n; i++) {
        
        strcat(str, "+");//strcat函数又被称为是字符串追加/连接函数，它的功能就是在一个字符串后面追加上另外一个字符串
        sprintf(str + strlen(str), "%d", arr[i]);//依次将arr[i]以十进制写入str

    }
  
    printf("%s", str);
}
return 0;
}