From f08d839283ee633f09d7fa01bd8612f4e83c2db2 Mon Sep 17 00:00:00 2001
From: Divakar <divakar2163@gmail.com>
Date: Thu, 29 Dec 2022 19:13:59 +0530
Subject: [PATCH] added time-based key val leetcode problem in cpp

---
 121 Leetcode/time_based_key_val.cpp | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 121 Leetcode/time_based_key_val.cpp

diff --git a/121 Leetcode/time_based_key_val.cpp b/121 Leetcode/time_based_key_val.cpp
new file mode 100644
index 00000000..9c58859d
--- /dev/null
+++ b/121 Leetcode/time_based_key_val.cpp	
@@ -0,0 +1,27 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+class TimeMap {
+public:
+    // initialising data structure as string=> {int,string}
+    unordered_map<string, vector<pair<int, string>>> m;
+    TimeMap() {
+    }
+    void set(string key, string value, int timestamp) {
+        m[key].push_back({timestamp, value});
+    }
+    string get(string key, int timestamp) {
+        if(!m.count(key))
+            return "";
+            // binary search 
+        int start = 0, end = m[key].size();
+        while(start < end) {
+            int mid = start + (end-start)/2;
+            if(m[key][mid].first > timestamp)
+                end = mid;
+            else
+                start = mid + 1;
+        }
+        return start > 0 and start <= m[key].size() ? m[key][start-1].second : "";
+    }
+};
\ No newline at end of file