小学信奥赛c++1014: 练4.4 牛吃牧草

#include <bits/stdc++.h>
using namespace std;
int s,s1,s2;
int main()
{
    s1=15*20;
    s2=20*10;
    s=(s1-s2)/(20-10);
    cout<<s;
    return 0;
}