recursion

Author: JabedWeb

recursion/add_number_n.cpp

@@ -0,0 +1,17 @@
+////https://codeforces.com/contest/266/problem/A
+#include <bits/stdc++.h>
+using namespace std;
+typedef long long ll;
+const int mod = 1e9 + 7;
+const int N = 1e5 + 5;
+
+int solve(int n){
+    if(n==1) return 1;
+    return solve(n-1)+n;
+}
+
+int main() {
+    ios_base::sync_with_stdio(0);
+    cin.tie(0);
+    cout << solve(7) <<endl;
+}