substring

dash.cpp

@@ -0,0 +1,38 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+    string s = "5F3Z-2e-9-w"; 
+    int k = 4;
+
+    string temp = "";
+
+
+    for (char c : s) {
+        if (c != '-') {
+            temp += toupper(c);
+        }
+    }
+
+
+    string result = "";
+    int count = 0;
+
+    for (int i = temp.size() - 1; i >= 0; i--) {
+        result.push_back(temp[i]);
+        count++;
+
+        if (count == k && i != 0) {
+            result.push_back('-');
+            count = 0;
+        }
+    }
+
+
+    reverse(result.begin(), result.end());
+
+
+    cout << result << endl;
+
+    return 0;
+}

subbstring.cpp

@@ -0,0 +1,30 @@
+#include <vector>
+#include <string>
+using namespace std;
+
+class Solution {
+public:
+    int countBinarySubstrings(string s) {
+        vector<int> groups; 
+        int count = 1;
+
+        // Step 1: Count consecutive groups
+        for (int i = 1; i < s.size(); i++) {
+            if (s[i] != s[i - 1]) {
+                groups.push_back(count);
+                count = 1;
+            } else {
+                count++;
+            }
+        }
+        groups.push_back(count);
+
+        // Step 2: Count valid substrings
+        int result = 0;
+        for (int i = 1; i < groups.size(); i++) {
+            result += min(groups[i - 1], groups[i]);
+        }
+
+        return result;
+    }
+};

water.cpp

@@ -0,0 +1,27 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+    vector<int> height = {1,8,6,2,5,4,8,3,7};  
+
+    int maxWater = 0;
+    int left = 0;
+    int right = height.size() - 1;
+
+    while (left < right) {
+        int h = min(height[left], height[right]);
+        int w = right - left;
+        int area = h * w;
+        maxWater = max(maxWater, area);
+
+        if (height[left] < height[right]) {
+            left++;
+        } else {
+            right--;
+        }
+    }
+
+    cout << "Maximum Water: " << maxWater << endl;
+
+    return 0;
+}