UVA11059 - Maximum Product

1、题目名称

Maximum Product

2、题目地址

https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=2000

3、题目内容

Given a sequence of integers S = {S1, S2, . . . , Sn}, you should determine what is the value of the maximum positive product involving consecutive terms of S. If you cannot find a positive sequence, you should consider 0 as the value of the maximum product.

Input

Each test case starts with 1 ≤ N ≤ 18, the number of elements in a sequence. Each element Si is an integer such that −10 ≤ Si ≤ 10. Next line will have N integers, representing the value of each element in the sequence. There is a blank line after each test case. The input is terminated by end of file (EOF).

Output

For each test case you must print the message: ‘Case #M: The maximum product is P.’, where M is the number of the test case, starting from 1, and P is the value of the maximum product. After each test case you must print a blank line.

Sample Input

3

2 4 -3

5

2 5 -1 2 -1

Sample Output

 

Case #1: The maximum product is 8.

 

Case #2: The maximum product is 20.

 

大致意思就是，给出一个序列，问这个序列中最大连续累乘的子序列中，最大的值为多少，如果都为负数，则输出0.

感受:  一定要记得用long long ， 还有格式问题，否则可能pe

#include"iostream"
using namespace std;
int a[20];
int main(){
    int n,out;
    out=0;
    while(cin>>n){
        for(int i=0;i<n;i++)
            cin>>a[i];
        long long max=0;
        for(int i=0;i<n;i++)
        for(int j=i;j<n;j++){
            long long z=1;
            for(int q=i;q<=j;q++)
                z=z*a[q];
            if(max<z)    max=z;
            }
    cout<<"Case #"<<++out<<": The maximum product is "<<max<<"."<<endl<<endl;

    }
}