Submission #1332038

#	Time	Username	Problem	Language	Result	Execution time	Memory
1332038		Andrey	Gingerbread (BOI25_gcd)	C++20	100 / 100	71 ms	4640 KiB

Main

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

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

vector<int> haha(0);

bool dude(int d, int br) {
    if(d == haha.size()) {
        int e = 0;
        for(int i = 0; i < haha.size(); i++) {
            e = gcd(e,haha[i]);
        }
        if(e == 1) {
            return 1;
        }
        return 0;
    }
    for(int i = 0; i <= br; i++) {
        haha[d]+=i;
        if(dude(d+1,br-i)) {
            return true;
        }
        haha[d]-=i;
    }
    return false;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int n;
    cin >> n;
    for(int i = 0; i < n; i++) {
        int a;
        cin >> a;
        haha.push_back(a);
    }
    int d = 0;
    for(int i = 0; i < n; i++) {
        d = gcd(d,haha[i]);
    }
    if(d == 1) {
        cout << 0;
        return 0;
    }
    if(n > 15) {
        cout << 1;
        return 0;
    }
    for(int i = 1; i < 1000; i++) {
        if(dude(0,i)) {
            cout << i;
            return 0;
        }
    }
    return 0;
}

• Subtask 1: 0 / 0
• Subtask 2: 17 / 17
• Subtask 3: 34 / 34
• Subtask 4: 11 / 11
• Subtask 5: 38 / 38