Formula for n*n Grid's square sum :{ n*(n+1)*(2n+1) }/6
Formula for n*m Grid's Rectangle sum : { n*(n+1) /2 }^2
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| /// Author : Shohan | |
| /// URI 1323 | |
| /// Problem level : Easy | |
| #include<stdio.h> | |
| int main() | |
| { | |
| int ans,n,t; | |
| while(scanf("%d",&n)==1){ | |
| if(n==0) | |
| break; | |
| ans=(n*(n+1)) * (2*n+1); | |
| t=ans/6; | |
| printf("%d\n",t); | |
| } | |
| return 0; | |
| } |
