Submission #631306

#	Time	Username	Problem	Language	Result	Execution time	Memory
631306		SanguineChameleon	Brunhilda’s Birthday (BOI13_brunhilda)	C++14	100 / 100	924 ms	168280 KiB

brunhilda

// BEGIN BOILERPLATE CODE

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

#ifdef KAMIRULEZ
	const bool kami_loc = true;
	const long long kami_seed = 69420;
#else
	const bool kami_loc = false;
	const long long kami_seed = chrono::steady_clock::now().time_since_epoch().count();
#endif

const string kami_fi = "kamirulez.inp";
const string kami_fo = "kamirulez.out";
mt19937_64 kami_gen(kami_seed);

long long rand_range(long long rmin, long long rmax) {
	uniform_int_distribution<long long> rdist(rmin, rmax);
	return rdist(kami_gen);
}

void file_io(string fi, string fo) {
	if (fi != "" && (!kami_loc || fi == kami_fi)) {
		freopen(fi.c_str(), "r", stdin);
	}
	if (fo != "" && (!kami_loc || fo == kami_fo)) {
		freopen(fo.c_str(), "w", stdout);
	}
}

void set_up() {
	if (kami_loc) {
		file_io(kami_fi, kami_fo);
	}
	ios_base::sync_with_stdio(0);
	cin.tie(0);
}

void just_do_it();

void just_exec_it() {
	if (kami_loc) {
		auto pstart = chrono::steady_clock::now();
		just_do_it();
		auto pend = chrono::steady_clock::now();
		long long ptime = chrono::duration_cast<chrono::milliseconds>(pend - pstart).count();
		string bar(50, '=');
		cout << '\n' << bar << '\n';
		cout << "Time: " << ptime << " ms" << '\n';
	}
	else {
		just_do_it();
	}
}

int main() {
	set_up();
	just_exec_it();
	return 0;
}

// END BOILERPLATE CODE

// BEGIN MAIN CODE

const int ms = 1e7 + 20;
const int inf = 1e9 + 20;
bool g[ms];
int pr[ms];
int p[ms];
int cc[ms];
int dp[ms];
int qz[ms];
int sz;

void just_do_it() {
	int n, q;
	cin >> n >> q;
	p[1] = 1;
	for (int i = 2; i < ms; i++) {
		if (!p[i]) {
			p[i] = i;
			pr[sz++] = i;
		}
		for (int j = 0; j < sz; j++) {
			if (i * pr[j] >= ms) {
				break;
			}
			p[i * pr[j]] = pr[j];
			if (i % pr[j] == 0) {
				break;
			}
		}
	}
	for (int i = 0; i < n; i++) {
		int d;
		cin >> d;
		g[d] = true;
	}
	cc[0] = n;
	int lt = 0;
	int rt = 0;
	for (int i = 1; i < ms; i++) {
		int f = -1;
		int x = i;
		while (x != 1) {
			if (p[x] != f) {
				f = p[x];
				if (g[f]) {
					cc[i]++;
					cc[i - p[x]]--;
				}
			}
			x /= p[x];
		}
		while (lt <= rt && !cc[qz[lt]]) {
			lt++;
		}
		if (lt > rt) {
			for (int j = i; j < ms; j++) {
				dp[j] = inf;
			}
			break;
		}
		else {
			dp[i] = dp[qz[lt]] + 1;
		}
		qz[++rt] = i;
	}
	for (int i = 0; i < q; i++) {
		int d;
		cin >> d;
		if (dp[d] == inf) {
			cout << "oo" << '\n';
		}
		else {
			cout << dp[d] << '\n';
		}
	}
}

// END MAIN CODE

Compilation message (stderr)

brunhilda.cpp: In function 'void file_io(std::string, std::string)':
brunhilda.cpp:25:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |   freopen(fi.c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
brunhilda.cpp:28:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |   freopen(fo.c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 60 / 60