Submission #872173

#	Time	Username	Problem	Language	Result	Execution time	Memory
872173		SalihSahin	Euklid (COCI20_euklid)	C++14	75 / 110	736 ms	516 KiB

euklid

#include<bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define int long long 
using namespace std;

const int N = 4e6 + 5;
const int mod = 1e9+7;
const int inf = 1e18 + 10;
const int L = 20 * 20 * 20;

int gcd(int a, int b){
    if(a < b) swap(a, b);
    if(b == 0) return a;
    return gcd(b, a%b);
}

int R(int a, int b){
    if(a < b) swap(a, b);
    if(b == 1) return a;
    return R(a/b, b);
}

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int t;
    cin>>t;
    while(t--){
        int g, h;
        cin>>g>>h;

        int a1 = 0, a2 = 0;

        for(int i = g; i <= N; i += g){
            int l = i * h / g * g - g;
            for(int j = l; j < i * (h + 1); j += g){
                if(gcd(i, j) == g && R(i, j) == h){
                    a1 = i, a2 = j;
                    break;
                }
            }

            if(a1 > 0) break;
        }

        cout<<a1<<" "<<a2<<endl;
    }
    /*
    vector<pair<int, int> > test;
    vector<pair<int, int> > cantsolve;
    for(int i = 1; i < 50; i++){
        for(int j = 2; j < 50; j++){
            test.pb(mp(i, j));
        }
    }

    for(auto itr: test){
        int g = itr.first, h = itr.second;

        if(g == h){
            continue;
        }

        int a = g * (h/g + (h%g ? 1 : 0));
        int b = -1;
        for(int i = g; i <= N; i += g){
            if(gcd(i, a) == g && r(i, a) == h){
                b = i;
                break;
            }
        }
        if(b > 0) continue;

        cantsolve.pb(mp(g, h));
    }

    for(auto itr: cantsolve){
        int g = itr.first, h = itr.second;

        int a = -1, b = -1;

        for(int i = g; i <= N; i += g){
            for(int j = i; j <= N; j += g){
                if(gcd(i, j) == g && r(i, j) == h) a = i, b = j;
                if(a > 0) break;
            }
            if(a > 0) break;
        }

        cout<<g<<" "<<h<<" ans = "<<a<<" "<<b<<endl;
    }
    */
    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 8 / 8
• Subtask 3: 8 / 8
• Subtask 4: 15 / 15
• Subtask 5: 40 / 40
• Subtask 6: 0 / 35