C++ :
#include<bits/stdc++.h> using namespace std; int n,a[1005],at; int main() { cin>>n; while(n) { if(n%26==0)a[++at]=26,n/=26,n--; else a[++at]=n%26,n/=26; } for(int i=at;i>=1;i--) cout<<char(a[i]+'A'-1); return 0; }
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