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problem_1.cpp

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+#include<bits/stdc++.h>
+using namespace std;
+void RemoveconsDuplicates(char* String)
+{
+    if(String[0] == '\0')
+    return;
+    if(String[0] == String[1])
+    {
+      int i =0;
+      while(String[i] != '\0'){
+          String[i] = String[i + 1];
+          i++;
+      }
+      RemoveconsDuplicates(String);
+
+    }
+    RemoveconsDuplicates(String + 1);
+}
+int main(){
+    char String[]="aabcca";
+    RemoveconsDuplicates(String);
+    cout<<String<< endl;
+    return 0;
+}

problem_2.cpp

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+#include<bits\stdc++.h>
+using namespace std;
+
+int SubArrayMaxSum(int arr[], int size)
+{
+    int maxfar = INT_MIN, maxendinghere = 0;
+
+    for (int i = 0; i < size; i++)
+    {
+        maxendinghere = maxendinghere + arr[i];
+        if (maxfar < maxendinghere)
+            maxfar = maxendinghere;
+
+        if (maxendinghere < 0)
+            maxendinghere = 0;
+    }
+    return maxfar;
+}
+
+
+int main()
+{   int N = 5;
+    int arr[] = {1,2,3,-2,5};
+
+    int maxsum = SubArrayMaxSum(arr, N);
+    cout << maxsum<<endl;
+    return 0;
+}

problem_3.cpp

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+#include<bits\stdc++.h>
+using namespace std;
+int RemoveDuplicates(int arr[], int n)
+{
+
+    if (n==0 || n==1)
+        return n;
+
+    int temp[n];
+
+
+    int j = 0;
+    for (int i=0; i<n-1; i++)
+
+        if (arr[i] != arr[i+1])
+            temp[j++] = arr[i];
+
+
+    temp[j++] = arr[n-1];
+
+
+    for (int i=0; i<j; i++)
+        arr[i] = temp[i];
+
+    return j;
+}
+
+
+int main()
+{   int N = 5 ;
+    int arr[] = {2,2,2,2,2};
+    N = RemoveDuplicates(arr, N);
+    for (int i=0; i<N; i++)
+       cout << arr[i] << " ";
+
+    return 0;
+}