/ SeriousOJ /

Record Detail

Time Exceeded


  
# Status Time Cost Memory Cost
#1 Accepted 101ms 16.109 MiB
#2 Accepted 114ms 16.277 MiB
#3 Accepted 98ms 16.035 MiB
#4 Accepted 119ms 16.125 MiB
#5 Accepted 104ms 16.074 MiB
#6 Accepted 97ms 16.18 MiB
#7 Accepted 138ms 16.207 MiB
#8 Accepted 115ms 16.324 MiB
#9 Accepted 92ms 16.293 MiB
#10 Accepted 116ms 16.324 MiB
#11 Accepted 101ms 16.352 MiB
#12 Accepted 88ms 16.406 MiB
#13 Accepted 106ms 16.402 MiB
#14 Accepted 91ms 16.184 MiB
#15 Accepted 117ms 16.59 MiB
#16 Accepted 157ms 16.66 MiB
#17 Accepted 401ms 17.188 MiB
#18 Accepted 147ms 16.27 MiB
#19 Accepted 295ms 16.461 MiB
#20 Accepted 333ms 16.473 MiB
#21 Accepted 375ms 16.5 MiB
#22 Accepted 425ms 16.496 MiB
#23 Accepted 321ms 16.52 MiB
#24 Accepted 362ms 16.535 MiB
#25 Accepted 212ms 16.516 MiB
#26 Accepted 301ms 16.516 MiB
#27 Accepted 507ms 16.508 MiB
#28 Accepted 419ms 16.559 MiB
#29 Accepted 926ms 16.551 MiB
#30 Time Exceeded ≥2080ms ≥17.094 MiB
#31 Accepted 613ms 17.094 MiB
#32 Accepted 197ms 16.484 MiB
#33 Accepted 126ms 17.633 MiB
#34 Accepted 178ms 16.375 MiB
#35 Time Exceeded ≥2091ms ≥16.98 MiB

Code

// #pragma GCC optimize("O3,unroll-loops,Ofast")
// #pragma GCC target("avx2")
#include<bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
#define int long long
#define endl '\n'

using namespace std;
using pii = pair<int, int>;
using tup = tuple<int, int, int>;

// mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
// template <class T> using ordered_set = tree<T, null_type,
//                          less<T>, rb_tree_tag, tree_order_statistics_node_update>;

const int inf = (1e15)+5;
const int mod = 1000000007;
const double eps = 1e-6;
const int N = 100005;

vector<int> divs[N];
void preprocess() {
	for (int i = 1; i < N; i++) {
		for (int j = i; j < N; j += i) {
			divs[j].push_back(i);
		}
	}
}

int n, a[N];
int cnt[N];


int calc(int x) {
	int tot = 0, out = 0;
	for(int i=1; i<=n; i++) {
		if(a[i] % x == 0) tot++;
		else out = gcd(out, a[i]);
	}

	int onno = n - tot;
	int lage;

	if(n % 2 == 0) {
		if(tot < n/2) return 0;
		lage = n / 2;
	}

	else {
		if(tot >= n/2+1) lage = n/2;
		else if(tot == n/2) lage = n/2+1;
		else return 0;
	}

	lage -= onno;

	for(int i=1; i<=n; i++) {
		if(a[i] % x) continue;
		for(int j : divs[a[i]])
			cnt[j]++;
	}

	// cout << tot << ' ' << onno << ' ' << lage << ' ' << out << endl;
	int ret = 0;
	for(int i=1; i<N; i++) {
		// cout << i << ' ' << cnt[i] << endl;
		if(out % i or cnt[i] < lage) continue;
		ret = max(ret, i);
	}

	for(int i=1; i<=n; i++) {
		if(a[i] % x) continue;
		for(int j : divs[a[i]])
			cnt[j]--;
	}
	// if(out % x == 0) ret *= x;
	
	// cout << x << ": " << ret + x << endl;
	return ret + x;
}

void solve(int tc) {
	cin >> n;
	for(int i=1; i<=n; i++) cin >> a[i];

	int ans = 0;
	for(int i : divs[a[1]]) ans = max(ans, calc(i));

	cout << ans << endl;
}
    
int32_t main() {
    cin.tie(NULL)->sync_with_stdio(false);
    cout.precision(10);

    preprocess();

    int T = 1;
    cin >> T;

    for (int i = 1; i <= T; i++) {
        solve(i);
    }

    return 0;
}

Information

Submit By
Type
Submission
Problem
P1077 Even Odd GCD (Hard Version)
Contest
Bangladesh 2.0
Language
C++20 (G++ 13.2.0)
Submit At
2024-08-16 17:09:03
Judged At
2024-10-03 13:23:49
Judged By
Score
95
Total Time
≥2091ms
Peak Memory
≥17.633 MiB