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A - Not Editorial by evima

One can get AC by writing a conditional branch with if statement, just as the problem statement indicates.

Sample code using a conditional branch (C++)

#include<iostream>
using namespace std;

int main(){
int x;
cin>>x;
if(x==0)cout<<1<<"\n";
if(x==1)cout<<0<<"\n";
}


Also, one may use a formula which becomes $$1$$ when $$x=0$$ and $$0$$ when $$x=1$$.

Sammple code using a formula（C++）

#include<iostream>
using namespace std;

int main(){
int x;
cin>>x;
cout<<1-x<<"\n";
}


Other than $$1-x$$, one can also use “not $$x$$” and “$$x$$ xor $$1$$.”

Here, “not” denotes negation and “xor” denotes exclusive logical sum.

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