fork download
copy 
  1. #include <stdio.h>
  2.  
  3. int main(){
  4.     int n;
  5.     scanf("%d", &n);
  6.  
  7.     int a = 3;
  8.     if(n != 1){
  9.         for(int i = 2; i <= n; i++){
  10.         a = 2*a -1;
  11.         }
  12.     }
  13.     int ans = a * a;
  14.     printf("%d", ans);
  15.     return 0;
  16. }
Success #stdin #stdout 0s 5508KB
comments (?)
stdin
copy 
15
stdout
copy 
1073807361
https://ideone.com/nJcVBV
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!