7-38 掉入陷阱的数字

输入样例:

5

输出样例:

1:16
2:22
3:13
4:13

ACcode:

#include 

using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> ans;

    int limit = 1;
    ans.push_back(n);

    for(int i=0; i<limit; i++){
        //各位数字的和
        int sum = 0;
        int num = ans[i];
        while(num != 0){
            sum += num%10;
            num /= 10;
        }
        
        ans.push_back(3*sum+1);
        if(ans[i] != ans[i+1]){
            limit ++;
        }
    }
    for(int i=1; i<ans.size(); i++){
        cout << i <<":"<< ans[i] << endl;
    }

    return 0;
}