Data Structure Array: Longest Monotonically Increasing Subsequence Size

http://www.geeksforgeeks.org/longest-monotonically-increasing-subsequence-size-n-log-n/

 1 #include <iostream>
 2 #include <vector>
 3 #include <algorithm>
 4 #include <queue>
 5 #include <stack>
 6 #include <string>
 7 #include <fstream>
 8 #include <map>
 9 using namespace std;
10 
11 int maxsum(int arr[], int n) {
12     vector<int> tail;
13     tail.push_back(arr[0]);
14     for (int i = 1; i < n; i++) {
15         if (arr[i] < tail[0]) tail[0] = arr[0];
16         else if (arr[i] > tail[tail.size()-1]) tail.push_back(arr[i]);
17         else {
18             int mid;
19             int left = 0;
20             int right = tail.size() - 1;
21             while (left < right) {
22                 mid = (left + right) / 2;
23                 if (tail[mid] < arr[i]) left = mid + 1;
24                 else right = mid - 1;
25             }
26             mid = (left + right) / 2;
27             tail[mid] = arr[i];
28             cout << "tail[" << mid << "] is arr[" << i << "] = " << arr[i] << endl;
29         }
30     }
31     return tail.size();
32 }
33 
34 int main() {
35     int arr[9] = {2, 5, 3, 7, 11, 8, 10, 13, 6};
36     cout << maxsum(arr, 9) << endl;
37     return 0;
38 }

posted @ 2014-04-09 05:09 ying_vincent 阅读(258) 评论(0) 收藏举报

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