diff --git a/hard/day_5/solution.cpp b/hard/day_5/solution.cpp
index c6ee274..fe27722 100644
--- a/hard/day_5/solution.cpp
+++ b/hard/day_5/solution.cpp
@@ -1 +1,55 @@
-//Write your code here
+#include <bits/stdc++.h> // Include necessary header files
+using namespace std;
+typedef long long ll; // Define a shorthand for long long
+
+const int MAXN = 5e5 + 5; // Define maximum array size
+
+ll initialArray[MAXN], differences[MAXN]; // Declare arrays for storing initial values and differences
+map<int, ll> valueChanges; // Declare a map to store the changes in values
+int queryLeft[MAXN], queryRight[MAXN]; ll queryValue[MAXN]; // Arrays to store left, right, and value changes for queries
+
+int main() { 
+    ios::sync_with_stdio(0); cin.tie(0); // Fast I/O
+
+    int t; cin >> t; // Input number of test cases
+    while (t--) { // Iterate over each test case
+        int n; cin >> n; // Input array size
+        for (int i = 1; i <= n; i++) // Input the initial array
+            cin >> initialArray[i];
+        int ans = 0; // Initialize the answer variable
+
+        int q; cin >> q; // Input number of queries
+        for (int i = 1; i <= q; i++) { // Loop over each query
+            int left, right; ll value; cin >> left >> right >> value; // Input query parameters
+            queryLeft[i] = left; queryRight[i] = right, queryValue[i] = value; // Store query parameters
+            valueChanges[left] += value; // Update the map with the value change
+            if (right + 1 <= n)
+                valueChanges[right + 1] -= value; // Adjust for the end of the range
+            while (!valueChanges.empty() && valueChanges.begin()->second == 0) // Remove zero values from the map
+                valueChanges.erase(valueChanges.begin());
+            if (!valueChanges.empty() && valueChanges.begin()->second < 0) { // If there's a negative value in the map
+                ans = i; // Update the answer with the current query index
+                valueChanges.clear(); // Clear the map
+            }
+        }
+
+        for (int i = 1; i <= ans; i++) { // Process queries up to the answer
+            int left = queryLeft[i], right = queryRight[i]; ll value = queryValue[i]; // Retrieve query parameters
+            differences[left] += value; // Update difference array at start index
+            if (right + 1 <= n)
+                differences[right + 1] -= value; // Adjust difference array at end index
+        }
+
+        for (int i = 1; i <= n; i++) { // Apply differences to the array
+            differences[i] += differences[i - 1]; // Accumulate differences
+            initialArray[i] += differences[i]; // Update array value
+            cout << initialArray[i] << " \n"[i == n]; // Output array value
+        }
+
+        // Initialize arrays and map for the next test case
+        for (int i = 1; i <= n; i++)
+            differences[i] = 0;
+        valueChanges.clear();
+    }
+    return 0; // End of program
+}
\ No newline at end of file