The partial sum problem

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描述 One day,Tom’s girlfriend give him an array A which contains N integers and asked him:Can you choose some integers from the N integers and the sum of them is equal to K.
输入There are multiple test cases.
Each test case contains three lines.The first line is an integer N(1≤N≤20),represents the array contains N integers. The second line contains N integers,the ith integer represents A[i](-10^8≤A[i]≤10^8).The third line contains an integer K(-10^8≤K≤10^8).输出If Tom can choose some integers from the array and their them is K,printf ”Of course,I can!”; other printf ”Sorry,I can’t!”.样例输入4
1 2 4 7
13
4
1 2 4 7
15
样例输出

Of course,I can!
Sorry,I can't!

代码：

#include <iostream>#include <string>#include <cstring>#include <algorithm>#include <iomanip>using namespace std;int n,m,a[25],flag;int dfs(int i,int sum){if(i==n)return sum==m;if(dfs(i+1,sum))return 1;if(dfs(i+1,sum+a[i]))return 1;return 0;}int main(){int i,j,k;while(cin>>n){for(i=0;i<n;i++)cin>>a[i];cin>>m;if(dfs(0,0)) cout<<"Of course,I can!"<<endl;else cout<<"Sorry,I can't!"<<endl;}return 0;}

转载于:https://www.cnblogs.com/wangyumin/p/5323418.html

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