1120 Friend Numbers (20 分)难度: 简单 / 知识点: 哈希表

Posted 2021-12-16 辉小歌

https://pintia.cn/problem-sets/994805342720868352/problems/994805352925609984

#include<bits/stdc++.h>
using namespace std;
const int N=1e5+10;
int cnt[N],n,x;
void solve(int x)

    int sum=0;
    while(x) sum+=x%10,x/=10;
    cnt[sum]++;

int main(void)

    cin>>n;
    for(int i=0;i<n;i++) cin>>x,solve(x);
    vector<int>ve;
    for(int i=0;i<N;i++) if(cnt[i]) ve.push_back(i);
    cout<<ve.size()<<endl;
    for(int i=0;i<ve.size();i++)
    
        if(i) cout<<" ";
        cout<<ve[i];
    
    return 0;