Create 962. Maximum Width Ramp

Author: Chayandas07

962. Maximum Width Ramp

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+class Solution {
+public:
+    int maxWidthRamp(vector<int>& nums) {
+        //decreasing stack
+
+        int n = nums.size();
+        stack<int> st;
+        for(int i = 0; i < n; i++){
+            if(st.empty() || nums[st.top()] > nums[i]){
+                st.push(i);
+            }
+        }
+        int ans = 0;
+        for(int i = n-1; i > 0; i--){
+            while(!st.empty() && nums[st.top()] <= nums[i]){
+                ans = max(ans, i - st.top());
+                st.pop();
+            }
+        }
+        return ans;
+    }
+};