Caracal vs Monster

D - Caracal vs Monster

1. 链接

   D - Caracal vs Monster

2. 代码实现

   #include<bits/stdc++.h>
   using namespace std;
   typedef long long ll;
   int main(void){
    ll n;
    cin >> n;
    int len = log2(n);
    ll ans = 1;
    for(int i = 1; i <= len+1; i++){
        ans *= 2;
    }
    cout<<ans-1<<endl;
    return 0;
   }