Обсуждение @ 1068. Сумма @ Timus Online Judge

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where is wrong !! already it is working in codeblocks EIASER ARAFAT 6 ноя 2017 16:02

#include<stdio.h>

int main(){
int n,sum=0,i;
scanf("%d",&n);-

if(n>0){
sum=(n*(n+1))/2;
}
else if(n<0){
sum=(n*(-1*n+1))/2;
}
printf("%d",sum);

}

Re: where is wrong !! already it is working in codeblocks Mahilewets Nikita 6 ноя 2017 19:46

Maybe for N < 0 the formula is
SUM = ((2-N)*(N+1))/2

Edited by author 06.11.2017 19:47

Re: where is wrong !! already it is working in codeblocks Mahilewets Nikita 6 ноя 2017 19:55

The first term is N
The last term is 1
So the average is (1+N)/2

There are (-N) terms below zero
And there are two more terms
They are 0 and one
So there are (2-N) total terms

So the sum is average by total number of terms

Re: where is wrong !! already it is working in codeblocks Juhi 15 июн 2020 11:20

But that should not make a difference

Re: where is wrong !! already it is working in codeblocks ToadMonster 7 ноя 2017 01:19

Case "N == 0" isn't processed

Re: where is wrong !! already it is working in codeblocks jim 22 фев 2018 07:10

thank you for your hint!

Re: where is wrong !! already it is working in codeblocks WeXoB 20 май 2020 08:51

Edited by author 20.05.2020 08:52

Edited by author 20.05.2020 08:52

Обсуждение задачи 1068. Сумма