题解 | #尼科彻斯定理#

#include <stdio.h>

int main()
{
    int m;
    while (scanf("%d", &m) != EOF)
    {
        int start = m*(m-1)+1;
        printf("%d", start);
        int i;
        for (i = 1; i < m; i++)
        {
            printf("+%d", start + 2 * i );
        }
        
        printf("\n");
    }
    
    return 0;
}