Watashi's BG(搜索)

http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3631

 1 #include <iostream>
 2 #include <cmath>
 3 #include <cstdio>
 4 #include <algorithm>
 5 using namespace std;
 6 int arr[50];
 7 int n,mx,m;
 8 void dfs(int cur,int total)
 9 {
10     if(mx==m) return ;
11     if(total>mx&&total<=m) mx=total;
12     for(int i=cur+1;i<n;i++) if(total+arr[i]<=m)
13     {
14         dfs(i,total+arr[i]);
15     }
16 }
17 int main()
18 {
19     int sum;
20     while(cin>>n>>m)
21     {
22         mx=0;sum=0;
23         for(int i=0;i<n;i++) {scanf("%d",arr+i);sum+=arr[i];}
24         if(sum<=m) {cout<<sum<<endl;continue;}
25         for(int i=0;i<n;i++) dfs(i,arr[i]);
26         cout<<mx<<endl;
27     }
28     return 0;
29 }