Submission

Score: 100

User: Folk_DIWA

Problemset: จับคู่เลขมงคล

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-14 00:36:05

#include <bits/stdc++.h>
using namespace std;

using ll = long long;

int main(){
    cin.tie(0)->sync_with_stdio(0);
    
    int n; cin >> n;
    vector <int> v(n);
    
    unordered_map <int,int> mp;
    for(int i=0; i<n; i++) cin >> v[i];
    
    int k; cin >> k;
    for(int i=0; i<n; i++){
        mp[abs(v[i]-k)] = i;
    }
    
    
    set <pair <int,int>> ans;
    for(int i=0; i<n; i++){

        if(mp.count(v[i])){

            if(mp[v[i]] < mp[abs(v[i]-k)]) ans.insert({mp[v[i]], mp[abs(v[i]-k)]});
            else if(mp[v[i]] > mp[abs(v[i]-k)]) ans.insert({mp[abs(v[i]-k)], mp[v[i]]});

        }
    }

    if(ans.empty()){
        cout << "No";
        return 0;
    }

    for(auto &s : ans) cout << v[s.first] << ' ' << v[s.second] << '\n';


    return 0;
}