POJ 2590

 1 #include<iostream>
 2 #include<algorithm>
 3 #define MAXN 1000000
 4 using namespace std;
 5 
 6 unsigned a[MAXN];
 7 
 8 int main()
 9 {
10     //freopen("acm.acm","r",stdin);
11     int i;
12     int num = 1;
13     int time = 0;
14     int x;
15     int y;
16     a[0] = 0;
17     for(i = 1; i < MAXN; ++ i)
18     {
19         a[i] = a[i-1] + num;
20         ++ time;
21         if(time == 2)
22         {
23             ++ num;
24             time = 0;
25         }
26     }
27     cin>>num;
28     while(num --)
29     {
30         cin>>x>>y;
31         cout<<lower_bound(a,a+MAXN,abs(y-x))-a<<endl;
32     }
33 }