Submission #406388

#	Time	Username	Problem	Language	Result	Execution time	Memory
406388		atoiz	Nicelines (RMI20_nicelines)	C++14	34 / 100	171 ms	1264 KiB

nicelines

#include <stdio.h>
#include <math.h>
#include <algorithm>
#include <vector>

#include "nice_lines.h"

const int X = 100000;

bool zero(long double x) { return std::abs(x) < 1; }
bool equals(long double x, long double y) { return zero(x - y); }

void add(int64_t Y, std::vector<int> &A, std::vector<int> &B) {
	int b = int(Y % X);
	while (b > 10000) b -= X;
	while (b < -10000) b += X;
	A.push_back((Y - b) / X), B.push_back(b);
}

int64_t roundDouble(long double x) {
	if (x < 0) return -int64_t(0.5 - x);
	else return int64_t(x + 0.5);
}

void solve_range(int64_t lo, long double dist_lo_0, long double dist_lo_1, int64_t hi, long double dist_hi_0, long double dist_hi_1, std::vector<int> &a, std::vector<int> &b) {
	long double diff_lo = (dist_lo_1 - dist_lo_0), diff_hi = (dist_hi_1 - dist_hi_0);
	if (lo >= hi) return;
	if (equals(dist_lo_0 + diff_lo * ((hi - lo) / 10000) * 0.25, dist_hi_0)) return;
	if (equals(dist_hi_0 + diff_hi * ((lo - hi) / 10000) * 0.25, dist_lo_0)) return;

	int64_t y = roundDouble(((dist_lo_0 * 40000 - diff_lo * lo) - (dist_hi_0 * 40000 - diff_hi * hi)) / (diff_hi - diff_lo));

	// fprintf(stderr, "%lf\n", double(((dist_lo_0 * 40000 - diff_lo * lo) - (dist_hi_0 * 40000 - diff_hi * hi)) / (diff_hi - diff_lo)));
	long double dist_y = query(X, y - 20000);
	// fprintf(stderr, "%lf == %lf\n", double(dist_y * 40000), double(dist_lo_0 * 40000 + (y - lo) * diff_lo));
	// fprintf(stderr, "%lf == %lf\n", double(dist_y * 40000), double(dist_hi_0 * 40000 + (y - hi) * diff_hi));
	if (equals(dist_y * 40000, dist_lo_0 * 40000 + (y - lo) * diff_lo) && equals(dist_y * 40000, dist_hi_0 * 40000 + (y - hi) * diff_hi)) {
		add(y - 20000, a, b);
		return;
	}

	int64_t md = y - (y % 100000) + 50000 + (y % 100000 > 80000) * 100000;
	long double dist_md_0 = query(X, md - 20000);
	long double dist_md_1 = query(X, md + 20000);

	solve_range(lo, dist_lo_0, dist_lo_1, md, dist_md_0, dist_md_1, a, b);
	solve_range(md, dist_md_0, dist_md_1, hi, dist_hi_0, dist_hi_1, a, b);
}

void solve(int subtask_id, int N) {
	int64_t lo = -10000000000ll + 50000, hi = 10000000000ll + 50000;
	std::vector<int> a, b;
	solve_range(lo, query(X, lo - 20000), query(X, lo + 20000), hi, query(X, hi - 20000), query(X, hi + 20000), a, b);
    the_lines_are(a, b);
}

• Subtask 1: 11 / 11
• Subtask 2: 0 / 13
• Subtask 3: 0 / 7
• Subtask 4: 0 / 19
• Subtask 5: 23 / 23
• Subtask 6: 0 / 27