函数_习题：编写函数求1+(1+3)+(1+3+5)+...(1+3+5...+(2n-1))

 # include <stdio.h>
int sum(int n)
{
 int team, i, j, sum=0;
 
 for(i=1; i<=n; i++)
 {
  team = 0;
  for(j=1; j<=i; j++)
  {
   team = team+2*j-1;
  }
        sum = sum + team;
 }
 return sum;
}
int main(void)
{
 int n;
 scanf("%d", &n);
 printf("%d\n", sum(n));
 
 return 0;