可能是数据的问题吧，后2个点怎么都WA

#include<iostream>
using namespace std;
int main(){
    int n, a, sum;
    cin >> n;
    a = n*n-n+1;
    cout << n << "^3=" << a;
    for(int i = 1; i < n; i++)cout << '+' << a+2*i;
    return 0;
}

#include<stdio.h>
#define N 100

int noco(int n,int *a);

int main()
{
int a[N],n,k,i;
scanf("%d",&n);
k=noco(n,a);
printf("%d^%d=",k,3);
for(i=0;i<k;i++)
{
printf("%d",a[i]);
if(i==k-1)
break;
printf("+");
}
printf("\n");
return 0;

}

int noco(int n,int *a)
{
int i,k,j;
k=n*n*n;
for(i=1;i>0;i+=2)
{
j=n*i+(n-1)*n;
if(k==j)
{
for(j=0;j<n;j++)
{
a[j]=i;
i+=2;
}
break;
}
}
return n;
}//前三绿后两红，不知道为何

#include <stdio.h>
#include <stdlib.h>

int noco(int n, unsigned long long *a)
{
unsigned long long mid = (unsigned long long)n * n;
if (n == 1)
{
a[0] = 1;
return 1;
}
if (n % 2 == 1)
{
mid = mid - (unsigned long long)(n / 2) * 2;
}
else if (n % 2 == 0)
{
mid--;
mid = mid - (unsigned long long)(n / 2-1) * 2;
}
for (int i = 0; i < n; i++)
a[i] = mid + (unsigned long long)i * 2;
return n;
}
int main()
{
unsigned long long a[100000];
int n;
scanf("%d", &n);
noco(n, a);
printf("%d^3=",n);
printf("%llu", a[0]);
for (int i = 1; i < n; i++)
printf("+%llu", a[i]);

return 0;
}//为什么前三个数据对了，后两个不对啊？我以为是数据溢出，改成llu还是不行。。。