Could someone explain me why I've got Crash #9?
I was trying all tests here but I've got nothing.

#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;

int n, a[111111], b[111111], i, l = 0, sum, index = 1;

int main()
{
    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif

    cin >> n;

    for(i=1;i<=100000;i++) {
        a[i] = a[i-1] + i;
    }

    while(true) {
        sum = a[index] - a[l] + l;
        if(sum == n) {
            int e = index - l + 1;
            if(l == 0)    l++, e--;
            cout << l << " " << e;
            return 0;
        }
        if(sum > n) {
            l++;
        }
        else {
            index++;
        }
    }

    return 0;
}

Edited by author 05.06.2011 21:10