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15 lines
225 B
15 lines
225 B
2 years ago
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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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int n;
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cin>>n;
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for(int i=0;i<n;i++){
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cout<<char('A'+i); //这个思路很重要
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cout<<char('a'+i);
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}
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return 0;
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}
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