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factorial.cpp

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+#include <iostream>
+using namespace std;
+
+int factorial(int ni){
+
+
+    if( ni == 1){ return 1;}
+    return ni * factorial(ni-1);
+}
+
+void main(){
+    int n =2;
+    int fact = factorial(n);
+    cout<<fact;
+}

power.cpp

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+#include <iostream>
+using namespace std;
+
+int pow(intlong long times){
+    if(times==0) return 1;
+    times--;
+    return n*pow(n,times);
+}
+
+int    long long n, times ;
+    cin>>n;
+    cin>>times;
+    cout<<pow(n,times);
+}