Added two codes in c++

first_and_last_occurenece_of_Element_of_String.cpp

@@ -0,0 +1,28 @@
+#include<bits/stdc++.h>
+using namespace std;
+void occurence(string str, int idx,char element){
+        int first,last=-1;
+    if(idx == str.length()){
+        cout<<first;
+        cout<<last;
+        return;
+    }
+    char currChar = str.at(idx);
+    if(currChar == element){
+        if(first == -1){
+            first=idx;
+        }
+        else{
+            last=idx;
+    }
+    }
+    occurence(str,idx+1,element);
+}
+
+int main(){
+string str;
+cin>>str;
+char element;
+cin>>element;
+occurence(str,0,element);
+}

middle_of_three_numbers.cpp

@@ -0,0 +1,25 @@
+#include<iostream>
+using namespace std;
+int main(){
+int A,B,C;
+cin>>A>>B>>C;
+//if((A-B)*(A-C)<0) return A;
+//else if((B-A)*(B-C)<0) return B;
+//else return C;
+//time taken 5 seconds
+//if(A>B) swap(A,B);
+//if(B>C)swap(B,C);
+//if(A>B) swap(A,B);
+//return B;
+//4 seconds
+
+//if(A>B && B>C || C>B && B>A)
+//return B;
+//else if(B>A && A>C || A>B && C>B)
+//return A;
+//else if(A>B && C>B || B>A && B>C)
+//return C;
+//worst method 9 seconds
+
+return (A>B && B>C)||(C>B && B>A) ? B : (B>A && A>C)||(C>A && A>B) ? A : C;
+}