Create numberOfLIS.cpp

Author: avidLearnerInProgress

numberOfLIS.cpp

@@ -0,0 +1,27 @@
+class Solution {
+public:
+    int findNumberOfLIS(vector<int>& nums) {
+        int n = nums.size();
+        vector <int> len(n, 1), cnt(n, 1);
+        int lis = 1;
+        for(int i = 1; i < n; i++){
+         for(int j = 0; j < i; j++){
+            if(nums[i] > nums[j]){
+               if(len[j] + 1 > len[i]){
+                  len[i] = len[j] + 1;
+                  cnt[i] = cnt[j];
+               }
+               else if(len[j] + 1 == len[i]){
+                  cnt[i] += cnt[j];
+               }
+            }
+            lis = max(lis, len[i]);
+         }
+        }
+        int ans = 0;
+        for(int i = 0; i < n; i++){
+         if(len[i] == lis)ans += cnt[i];
+        }
+        return ans;
+    }
+};