제출 #778282

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
778282		SanguineChameleon	Palindrome-Free Numbers (BOI13_numbers)	C++17	100 / 100	1 ms	444 KiB

numbers

// 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

long long dp[20][10][10][2][4];
int dz[20];

long long solve(long long x) {
	if (x == -1) {
		return 0;
	}
	fill_n(&dp[0][0][0][0][0], 20 * 10 * 10 * 2 * 4, 0);
	for (int i = 18; i >= 0; i--) {
		dz[i] = x % 10;
		x /= 10;
	}
	dp[0][0][0][0][0] = 1;
	for (int a = 0; a <= 18; a++) {
		for (int b = 0; b < 10; b++) {
			for (int c = 0; c < 10; c++) {
				for (int d = 0; d < 2; d++) {
					for (int e = 0; e < 4; e++) {
						if (dp[a][b][c][d][e] == 0) {
							continue;
						}
						for (int i = 0; i < 10; i++) {
							if ((e >= 1 && i == c) || (e >= 2 && i == b) || (d == 0 && i > dz[a])) {
								continue;
							}
							int na = a + 1;
							int nb = c;
							int nc = i;
							int nd = d || (i < dz[a]);
							int ne = (e > 0) ? min(e + 1, 3) : (i > 0);
							dp[na][nb][nc][nd][ne] += dp[a][b][c][d][e];
						}
					}
				}
			}
		}
	}
	long long res = 0;
	for (int b = 0; b < 10; b++) {
		for (int c = 0; c < 10; c++) {
			for (int d = 0; d < 2; d++) {
				for (int e = 0; e < 4; e++) {
					res += dp[19][b][c][d][e];
				}
			}
		}
	}
	return res;
}

void just_do_it() {
	long long x, y;
	cin >> x >> y;
	cout << solve(y) - solve(x - 1);
}

// END MAIN CODE

컴파일 시 표준 에러 (stderr) 메시지

numbers.cpp: In function 'void file_io(std::string, std::string)':
numbers.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);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
numbers.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: 25 / 25
• Subtask 2: 75 / 75