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[題解]CSES 1617 Bit Strings

Bit Strings

題目連結

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#include <bits/stdc++.h>
#define int long long
#define N 1000005
#define mod 1000000007
using namespace std;
int n;

void solve(){
int ans = 1;
for(int i=0;i<n;i++){
ans *= 2;
ans = ans % mod;
}
cout<<ans<<"\n";
}

signed main(){
cin>>n;
solve();
return 0;
}