1120. Friend Numbers (20) 统计友元

题目地址

直接统计，用set去重。

//// Created by aleafall on 16-12-10.//#include <bits/stdc++.h>using namespace std;int main() {    int n, m, x;    set<int> st;    cin >> n;    for (int i = 0; i < n; ++i) {        cin >> x;        int temp = 0;        while (x) {            temp += x % 10;            x /= 10;        }        st.insert(temp);    }    m = (int) st.size();    cout << m << endl;    for (auto item:st) {        --m;        if (m) {            cout << item << " ";        } else {            cout << item << endl;        }    }    return 0;}