问题 F: Sandglass2
时间限制: 1 Sec 内存限制: 128 MB
提交: 341 解决: 210
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题目描述
We have a sandglass that runs for X seconds. The sand drops from the upper bulb at a rate of 1 gram per second. That is, the upper bulb initially contains X grams of sand.
How many grams of sand will the upper bulb contains after t seconds?
Constraints
1≤X≤109
1≤t≤109
X and t are integers.
输入
The input is given from Standard Input in the following format:
X t
输出
Print the number of sand in the upper bulb after t second.
样例输入
100 17
样例输出
83
提示
17 out of the initial 100 grams of sand will be consumed, resulting in 83 grams.
注意：t>=X 时答案为 0。
#include<iostream>
using namespace std;
int main()
{
long long n,m;
while(cin>>n>>m)
{
if(m>=n)
cout<<0<<endl;
else
cout<<n-m<<endl;
}
return 0;
}