Topcoder 酱油记

 1 // BEGIN CUT HERE
 2 
 3 // END CUT HERE
 4 #line 5 "GoodSubset.cpp"
 5 
 6 #include <string>
 7 #include <vector>
 8 #include <map>
 9 #include <iostream>
10 using namespace std;
11 typedef long long LL;
12 #define foreach(it,v) for(__typeof((v).rbegin()) it=(v).rbegin();it!=(v).rend();it++)
13 const int size = 50001;
14 
15 map<int, int> ans;
16 class GoodSubset {
17     public:
18     int numberOfSubsets(int goodValue, vector <int> d) {
19         for (int i = 0; i < d.size(); i++)
20         {
21             foreach(it, ans)
22             {
23                 LL y = it->first;
24                 if (y * d[i] >goodValue) continue;
25                 ans[y * d[i]] = (ans[y * d[i]] + it->second) % 1000000007ll;
26             }
27             ans[d[i]]++;
28         }
29         return ans[goodValue];
30     }
31 };