25 lines
345 B
C++
25 lines
345 B
C++
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#include<bits/stdc++.h>
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using namespace std;
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char a[9999999]= {0};
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int main() {
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int n,t,i,j,k;
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scanf("%d",&n);
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for(k=1; k<=n; k++) {
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t=pow(2,k)/2;
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a[t]='A'+k-1;
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if(k>1) {
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j=t+1;
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for(i=t-1; i>0; i--) {
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a[j]=a[i];
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j++;
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}
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}
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}
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t=pow(2,n);
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for(i=1; i<t; i++)
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printf("%c",a[i]);
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return 0;
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}
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