题目描述
You are given two integers a and b (a≤b). Determine if the product of the integers a, a+1, …, b is positive, negative or zero.
Constraints
a and b are integers.
−109≤a≤b≤109
Partial Score
In test cases worth 100 points, −10≤a≤b≤10.
Constraints
a and b are integers.
−109≤a≤b≤109
Partial Score
In test cases worth 100 points, −10≤a≤b≤10.
输入
The input is given from Standard Input in the following format:
a b
a b
输出
If the product is positive, print Positive. If it is negative, print Negative. If it is zero, print Zero.
样例输入
1 3
样例输出
Positive
提示
1×2×3=6 is positive.
不知道该这么说,也是一道简单题。。。就对a,b进行判断,如果a<=0&&b>=0,从a到b的数乘积一定为0,直接输出Zero;否则就判断a<=0,并用b减去a,判断能否被2整除,能则输出Positive,不能则输出Negative;再否则就直接输出Positive。
以下贴上代码:
#include<cstdio> #include<iostream> using namespace std; int main() { int a,b; while(cin>>a>>b) { if(a<=0&&b>=0) cout<<"Zero"<<endl; else if(a<0) { int key=b-a; if(key%2!=0) cout<<"Positive"<<endl; else cout<<"Negative"<<endl; } else cout<<"Positive"<<endl; } }