基础训练 FJ的字符串

FJ的字符串

#include<iostream>
#include<string.h>
using namespace std;
int main(){
    string str=""; 
    int N;
    cin>>N;
    for(int i=0; i<N; i++){
        string s=str;
        str.append(1,'A'+i);
        str+=s;
    }
    cout<<str<<endl;
    return 0;
} 

标签：std,main,int,基础训练,字符串,FJ,include
来源： https://www.cnblogs.com/A-Little-Nut/p/10350974.html