text: # Problem problem Given $ N $ different natural numbers $ a_i $.I decided to make a pair by choosing a different natural number from the given natural numbers.Output one pair that can be created with a value difference that is a multiple of $ N -1 $.It should be noted that such a pair always exists.Example Input 5 1 2 4 7 10 Output 2 10 # Solution #include "bits/stdc++.h" using namespace std; typedef long long ll; typedef pair<int, int> pii; typedef pair<ll, ll> pll; const int INF = 1e9; const ll LINF = 1e18; template<class S,class T> ostream& operator << (ostream& out,const pair<S,T>& o){ out << "(" << o.first << "," << o.second << ")"; return out; } template<class T> ostream& operator << (ostream& out,const vector<T> V){ for(int i = 0; i < V.size(); i++){ out << V[i]; if(i!=V.size()-1) out << " ";} return out; } template<class T> ostream& operator << (ostream& out,const vector<vector<T> > Mat){ for(int i = 0; i < Mat.size(); i++) { if(i != 0) out << endl; out << Mat[i];} return out; } template<class S,class T> ostream& operator << (ostream& out,const map<S,T> mp){ out << "{ "; for(auto it = mp.begin(); it != mp.end(); it++){ out << it->first << ":" << it->second; if(mp.size()-1 != distance(mp.begin(),it)) out << ", "; } out << " }"; return out; } /* <url:https://onlinejudge.u-aizu.ac.jp/services/room.html#RitsCamp18Day1/problems/A> 問題文============================================================ N 個の相違なる自然数 ai が与えられる。与えられた自然数から相違なる自然数を選び、ペアを作ることにした。作ることができるペアのうち、値の差が N−1 の倍数であるペアを一つ出力せよ。なお、そのようなペアは必ず存在する。