ACM && Find Minimum in Rotated Sorted Array

 1 /*Find Minimum in Rotated Sorted Array */
 2 #include <iostream>
 3 #include <vector>
 4 using namespace std;
 5 
 6 int find(vector <int>& num, int begin, int end) ;
 7 int findMin(vector<int> &num) {
 8     cout<<num.size();
 9     return find(num, 0,  num.size()-1 );
10 }
11 
12 int find(vector<int> &num, int begin, int end) {
13     cout<<"begin: "<<num[begin]<<"  end: "<<num[end]<<endl;
14     if(begin==end)
15         return num[end];
16     if(begin==end-1)
17         return num[begin]>num[end]?num[end]:num[begin];
18     if(num[begin]<num[end])
19         return num[begin];
20     int mid=(begin+end)/2;
21     cout<<"mid:"<<num[mid]<<endl;
22     if(num[mid]>num[begin])
23         return find(num, mid+1, end);
24     else if(num[mid]<num[begin])
25         return find(num,begin, mid);
26     else {
27         int a,b;
28         a=find(num, begin, mid);
29         b=find(num, mid, end);
30         return a>b?b:a;
31     }
32 }
33 
34 void main(){
35     int a[3]={3,1,1};
36     vector<int> num(a, a+3);
37     int c=findMin(num);
38     cout<<c<<endl;
39     while(1);
40 }