Submission #3352428

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Source Code Expand

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

using VS = vector<string>;    using LL = long long;
using VI = vector<int>;       using VVI = vector<VI>;
using PII = pair<int, int>;   using PLL = pair<LL, LL>;
using VL = vector<LL>;        using VVL = vector<VL>;

#define ALL(a)  begin((a)),end((a))
#define RALL(a) (a).rbegin(), (a).rend()
#define SZ(a) int((a).size())
#define SORT(c) sort(ALL((c)))
#define RSORT(c) sort(RALL((c)))
#define UNIQ(c) (c).erase(unique(ALL((c))), end((c)))
#define FOR(i, s, e) for (int(i) = (s); (i) < (e); (i)++)
#define FORR(i, s, e) for (int(i) = (s); (i) > (e); (i)--)
#define debug(x) cerr << #x << ": " << x << endl
const int INF = 1e9;                          const LL LINF = 1e16;
const LL MOD = 1000000007;                    const double PI = acos(-1.0);
int DX[8] = { 0, 0, 1, -1, 1, 1, -1, -1 };    int DY[8] = { 1, -1, 0, 0, 1, -1, 1, -1 };

/* -----  2018/10/06  Problem: abc112 D / Link: __CONTEST_URL__  ----- */
/* ------問題------



-----問題ここまで----- */
/* -----解説等-----



----解説ここまで---- */

VL f(LL n) {
	VL res;
	for (LL i = 1; i*i <= n; i++) {
		if (n%i == 0) {
			res.push_back(i);
			if (n / i != i)res.push_back(n / i);
		}
	}
	SORT(res);
	return res;
}

int main() {
	cin.tie(0);
	ios_base::sync_with_stdio(false);

	// (N+K)G=M ,(K≧0) M%G==0
	LL N, M; cin >> N >> M;
	VL divs = f(M);
	LL ans = 0;
	FOR(i, 0, SZ(divs)) {
		LL x = M / divs[i];
		if (x >= N) {
			ans = max(ans, divs[i]);
		}
	}
	cout << ans << "\n";

	return 0;
}

Submission Info

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