diff --git a/DAY52/substring.cpp b/DAY52/substring.cpp
new file mode 100644
index 0000000..1f2a321
--- /dev/null
+++ b/DAY52/substring.cpp
@@ -0,0 +1,17 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+int32_t main(){
+    string s = "abcabcabc";
+    int n = s.size();
+    //cin >> s;
+    vector <int> dict(256,-1);
+    int maxl =0;int start =-1;
+    for(int i=0;i<n;i++){
+       if(dict[s[i]] > start)
+       start = dict[s[i]];
+       dict[s[i]] = i;
+       maxl = max(maxl , i-start);
+    }
+    cout << maxl;
+}
\ No newline at end of file
diff --git a/DAY53/print_matrix_in_snake_pattern.cpp b/DAY53/print_matrix_in_snake_pattern.cpp
new file mode 100644
index 0000000..2d8cf20
--- /dev/null
+++ b/DAY53/print_matrix_in_snake_pattern.cpp
@@ -0,0 +1,29 @@
+#include <bits/stdc++.h>
+using namespace std;
+class Solution
+{   
+    public:
+    //Function to return list of integers visited in snake pattern in matrix.
+    vector<int> snakePattern(vector<vector<int> > arr)
+    {   
+        // code here
+        int n = arr.size();
+        vector<int> v;
+        for(int i=0;i<n;i++){
+            if(i %2 ==0){
+                for(int j=0;j<n;j++){
+                v.push_back(arr[i][j]);
+            
+            }
+            }
+            else{
+            for(int j=n-1;j>=0;j--){
+                v.push_back(arr[i][j]);
+                
+            }
+            
+        }
+    }
+    return v;
+    }
+};
\ No newline at end of file
diff --git a/DAY54/kadane_algorithm.cpp b/DAY54/kadane_algorithm.cpp
new file mode 100644
index 0000000..c25f7ed
--- /dev/null
+++ b/DAY54/kadane_algorithm.cpp
@@ -0,0 +1,18 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+int maxsum(vector<int> arr){
+    int curr_sum = 0;
+    int max_sum = INT_MIN;
+    for(const int x: arr){
+    curr_sum += x;
+    max_sum = max(max_sum, curr_sum);
+    
+    }
+    return max_sum;
+}
+int main(){
+    vector<int> arr = {2, 5, 6, 7, 0, -8};
+    int n = arr.size();
+    cout << maxsum(arr) << endl;
+}
diff --git a/DAY55/spiral.cpp b/DAY55/spiral.cpp
new file mode 100644
index 0000000..1d3910b
--- /dev/null
+++ b/DAY55/spiral.cpp
@@ -0,0 +1,50 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+vector<int> spiralOrder(vector<vector<int>>& A) {
+int T,B,L,R,dir;
+    T=0;
+    B=A.size()-1;
+    L=0;
+    R=A[0].size()-1;
+    dir=0;
+    int i;
+    vector<int> ans;
+    
+    while(T<=B && L<=R)
+    {
+        if(dir==0)
+        {
+            for(i=L;i<=R;i++)
+                ans.push_back(A[T][i]);
+            T++;
+        }
+        else if(dir==1)
+        {
+            for(i=T;i<=B;i++)
+                ans.push_back(A[i][R]);
+            R--;
+        }
+        else if(dir==2)
+        {
+            for(i=R;i>=L;i--)
+                ans.push_back(A[B][i]);
+            B--;
+        }
+        else if(dir==3)
+        {
+            for(i=B;i>=T;i--)
+                ans.push_back(A[i][L]);
+            L++;
+        }
+        dir=(dir+1)%4;
+    }
+    return ans;
+};
+int main(){
+    vector<vector<int>> A  = {{{1,2,3},{4,5,6},{7,8,9}}};
+    for(int x: spiralOrder(A)){
+        cout << x  << " ";
+    }
+
+}
\ No newline at end of file
diff --git a/DAY56/kmp.cpp b/DAY56/kmp.cpp
new file mode 100644
index 0000000..f14bfe6
--- /dev/null
+++ b/DAY56/kmp.cpp
@@ -0,0 +1,27 @@
+#include <iostream> 
+using namespace std;
+int func (string s, string p , int n , int m){
+    int count =0;
+    for(int i=0;i<n;i++){
+        int k =0;
+        int l =0;
+        for(int j=i;j<m+i-1;j++){
+            if(s[i] != p[i]){
+                l =1;
+                break;
+            }
+            k++;
+        }
+        if(l==0){
+            count++;
+        }
+    }
+    return count;
+}
+int main(){
+    string s = "abcabcabc";
+    string p = "abc";
+    int n = s.size();
+    int m = p.size();
+    cout << func(s, p, m, n) << endl;
+}
\ No newline at end of file
diff --git a/DAY57/xor_equation.cpp b/DAY57/xor_equation.cpp
new file mode 100644
index 0000000..d28d103
--- /dev/null
+++ b/DAY57/xor_equation.cpp
@@ -0,0 +1,25 @@
+#include <iostream>
+using namespace std;
+
+int main() {
+    int t;
+    cin >> t;
+    while(t--){
+        int n;
+        int x;
+        cin >> n;
+        int count =0;
+        int arr[n];
+        for(int i=0;i<n;i++){
+            cin >> arr[i];
+            if((arr[i] +x) ^ (arr[i+1] +x) == 0){
+                count++;
+            }
+            else
+            cout << -1 << endl;
+        }
+        cout << count << endl;
+    }
+	// your code goes here
+	return 0;
+}
diff --git a/DAY58/triplet_with_bitwise_and.cpp b/DAY58/triplet_with_bitwise_and.cpp
new file mode 100644
index 0000000..bb86e09
--- /dev/null
+++ b/DAY58/triplet_with_bitwise_and.cpp
@@ -0,0 +1 @@
+solve(c , r,i, j);
\ No newline at end of file
diff --git a/DAY59/search_int_rotated.cpp b/DAY59/search_int_rotated.cpp
new file mode 100644
index 0000000..849cc62
--- /dev/null
+++ b/DAY59/search_int_rotated.cpp
@@ -0,0 +1,13 @@
+class Solution {
+public:
+    int search(vector<int>& nums, int target) {
+        int n = nums.size();
+        int ans =0;
+        for(int i=0;i<n;i++){
+           if(nums[i] == target)
+               return i;
+        }
+    
+        return -1;
+    }
+};
\ No newline at end of file
diff --git a/DAY60/find_all_numberdisappear_inarr.cpp b/DAY60/find_all_numberdisappear_inarr.cpp
new file mode 100644
index 0000000..3e9e0fc
--- /dev/null
+++ b/DAY60/find_all_numberdisappear_inarr.cpp
@@ -0,0 +1,24 @@
+class Solution {
+public:
+    vector<int> findDisappearedNumbers(vector<int>& vec) {
+        vector<int> mis;
+ 
+    // For every given element
+    for (int i = 0; i < vec.size(); i++) {
+ 
+        // Find its index
+        int temp = abs(vec[i]) - 1;
+ 
+        // Update the element at the found index
+        vec[temp] = vec[temp] > 0 ? -vec[temp] : vec[temp];
+    }
+    for (int i = 0; i < vec.size(); i++)
+ 
+        // Current element was not present
+        // in the original vector
+        if (vec[i] > 0)
+            mis.push_back(i + 1);
+ 
+    return mis;
+    }
+};
\ No newline at end of file
diff --git a/DAY61/matrix.cpp b/DAY61/matrix.cpp
new file mode 100644
index 0000000..c8be288
--- /dev/null
+++ b/DAY61/matrix.cpp
@@ -0,0 +1,15 @@
+#include <iostream>
+#include <bits/stdc++.h>
+using namespace std;
+int main(){
+vector<vector<int>> matrix;
+     int n = matrix.size();
+     int m = matrix[0].size();
+     for(int i=0;i<n;i++){
+        for(int j=0;j<m;j++){
+            cin >> matrix[i][j];
+            cout << matrix[i][j];
+        }
+     }
+     return 0;
+}