Discussion @ 1068. Sum @ Timus Online Judge

Yuriy WA TEST #2 [3] // Problem 1068. Sum 19 Feb 2012 17:13

tell me what's wrong in my code ???

#include <stdio.h>
#include <math.h>
void main ()
{
    long N=-1,sum=0;
    int i=0;
    scanf("%d",&N);
    if (abs(N)<=10000)
    {
    if (N>0)
    {
    for (i=N;i>1;--i)
    {
    sum+=i;
    }
    }
    else if (N<0)
    {
        for (i=N;i<-1;++i)
        {
            sum+=i;
        }
    }
    printf("%ld",sum);
    }
}

papkov_nikita Re: WA TEST #2 // Problem 1068. Sum 22 Feb 2012 02:08

for (i=N;i<-1;++i)
"лежащих между 1 и N включительно."
may be because 1 != -1 ?
for(i=N;i<=+1;i++)

Edited by author 22.02.2012 02:08

Misha ignatyuk Re: WA TEST #2 // Problem 1068. Sum 7 Mar 2012 18:11

Edited by author 07.03.2012 18:11

Edited by author 07.03.2012 18:11

navi1893 Re: WA TEST #2 // Problem 1068. Sum 21 Jun 2012 05:37

Try so ;)

#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int a, sum = 0;
    cin >> a;

    if( a > 0 )
    {
        for ( int i = 1; i <= a; i++)
        sum += i;
    }

    else
    {
        for (int i = 1; i <= abs(a); i++)
        sum += i;
        sum = 1 - sum;
    }

    cout << sum;
    return 0;
}

Discussion of Problem 1068. Sum