Merge pull request #115 from Ghanshyam-07/fix/Maximum-swap

Create question.md and solution.cpp

Author: Kushal997-das

Beginner Level 📁/Maximum Swap/question.md

@@ -0,0 +1,21 @@
+### Maximum Swap
+
+You are given an integer num. You can swap two digits at most once to get the maximum valued number.
+Return the maximum valued number you can get.
+
+### Example 1:
+
+Input: num = 2736
+Output: 7236
+Explanation: Swap the number 2 and the number 7.
+
+### Example 2:
+
+Input: num = 9973
+Output: 9973
+Explanation: No swap.
+
+ 
+## Constraints:
+
+   -  0 <= num <= 108

Beginner Level 📁/Maximum Swap/solution.cpp

@@ -0,0 +1,46 @@
+#include <iostream>
+#include <string>
+#include <vector>
+#include <algorithm>  // For the swap function
+
+using namespace std;
+
+class Solution {
+public:
+    int maximumSwap(int num) {
+        string str = to_string(num);
+        vector<int> last(10, -1);
+        
+        // Record the last occurrence of each digit
+        for (int i = 0; i < str.length(); i++) {
+            last[str[i] - '0'] = i;
+        }
+        
+        // Try to find the first place to swap for maximizing the number
+        for (int i = 0; i < str.length(); i++) {
+            for (int d = 9; d > str[i] - '0'; d--) {
+                if (last[d] > i) {
+                    swap(str[i], str[last[d]]);
+                    return stoi(str);
+                }
+            }
+        }
+        
+        return num;
+    }
+};
+
+int main() {
+    Solution solution;
+    int num;
+
+    // Take input from the user
+    cout << "Enter a number: ";
+    cin >> num;
+
+    // Call the function and display the result
+    int result = solution.maximumSwap(num);
+    cout << "Maximum number after swap: " << result << endl;
+
+    return 0;
+}

Beginner Level 📁/data.json

@@ -44,7 +44,7 @@
   },
   {
     "name": "Ghanshyam Saini",
-    "githubUsername": "Ghanshyam07"
+    "githubUsername": "Ghanshyam-07"
   },
   {
     "name": "Neyna Nayak",
@@ -61,6 +61,7 @@
 
     "name": "Dhara Bindal",
     "githubUsername": "bindaldhara"
+ 
   }
   {
     "name": "Avid Coder",