平方和与立方和
http://acm.hdu.edu.cn/showproblem.php?pid=2007
1 /*write by ASUN*/
2 #include"stdio.h"
3 void main()
4 {
5 long int n,m;
6 double sumj,sumy;
7 while(scanf("%ld%ld",&m,&n)!=EOF)
8 {
9 sumj=sumy=0;
10 if(m>n) //有可能n小于m,这点题目没有将清楚
11 {
12 m=m+n;
13 n=m-n;
14 m=m-n;
15 }
16 for(;m<=n;m++)
17 {
18 if(m%2==1)
19 sumj+=m*m*m*1.0;
20 else
21 sumy+=m*m*1.0;
22 }
23 printf("%.0lf %.0lf\n",sumy,sumj);
24 }
25 }
1 /*written by czk*/
2 #include <stdio.h>
3
4 int square_sum(int n) {
5 return n*(n+1)*(2*n+1)/6;
6 }
7
8 int cube_sum(int n) {
9 return n*(n+1)/2*n*(n+1)/2;
10 }
11
12 int sum(int n) {
13 return n*(n+1)/2;
14 }
15
16 /* cube sum of 1, 3, 5,...,(2*n-1) */
17 int odd_cube_sum(int n) {
18 return 8*cube_sum(n) - 12*square_sum(n) + 6*sum(n) - n;
19 }
20
21
22 int main() {
23 int m, n;
24 while(scanf("%d%d", &m, &n)!=EOF) {
25 if(n < m) {
26 int temp = m;
27 m = n;
28 n = temp;
29 }
30 printf("%d ", 4*(square_sum(n/2)-square_sum((m-1)/2)));
31 printf("%d\n", odd_cube_sum((n+n%2)/2)- odd_cube_sum( (m-m%2)/2));
32 }
33 }