判断小于九位数的数是否有重复数字

Question

数组来解题
不知道如何判断重复数字
无重复输出yes
有重复输出no

Answer 1

#include<iostream>
#include<map>
using namespace std;
 
int main(){
    int tar_num ;
    map<int, bool> digits;
    cin>>tar_num;
    bool res = false;
    while(tar_num != 0){
        if(digits.count(tar_num % 10)){//判断当前的数字之前是否出现过
            res = true;
            break;
        }
        digits[tar_num%10] = true;
        tar_num = tar_num / 10;
    }
    if(res){
        cout<<"no"<<endl;
    }else{
        cout<<"yes"<<endl;
    }
    return 0;
}