sgu276：Andrew's Troubles(大大大水題)

還有這麼水的題...
AC code：

#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <cctype>
#include <algorithm>
#include <string>
#include <sstream>
#include <iostream>
#include <map>
#include <set>
#include <list>
#include <stack>
#include <queue>
#include <vector>
#define pb push_back
#define mp make_pair
typedef long long LL;
typedef double DB;
typedef long double LD;
using namespace std;
int main()
{
    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif

    int a, b;
    scanf("%d%d", &a, &b);
    if(b-a >= 1800) puts("4");
    else if(b-a >= 900) puts("3");
    else if(b-a >= 300) puts("2");
    else if(b > a) puts("1");
    else puts("0");

    #ifndef ONLINE_JUDGE
    fclose(stdin);
    fclose(stdout);
    #endif
    return 0;
}