Submission #828470

#	Time	Username	Problem	Language	Result	Execution time	Memory
828470		rainboy	Nicelines (RMI20_nicelines)	C11	0 / 100	29 ms	208 KiB

nicelines

#include "nice_lines_c.h"
 
#define N	100
#define M	10000
#define X	(M * 2 + 1)
#define Y	((long long) M * X + M + 1)
 
typedef long double ld;
 
ld abs_(ld a) { return a > 0 ? a : -a; }
ld max(ld a, ld b) { return a > b ? a : b; }

long double error(long double a, long double b) {
	return abs_(a - b) / max(abs_(b), 1);
}

void solve(int subtask_id, int n) {
	static int aa[N], bb[N];
	long long y, y1, lower, upper, a, b;
	ld z, z1, z2;
	int i;
 
	y1 = -Y, z1 = query(X, y1), z2 = query(X, y1 + 1);
	for (i = 0; i < n; i++) {
		lower = y1, upper = Y + 1;
		while (upper - lower > 1) {
			y = (lower + upper) / 2;
			z = query(X, y);
			if (error(z1 + (z2 - z1) * (y - y1), z) < 1e-12)
				lower = y;
			else
				upper = y;
		}
		y1 = lower, z1 = query(X, y1), z2 = query(X, y1 + 1);
		a = lower / X, b = y1 - a * X;
		while (b > M)
			a++, b -= X;
		while (b < -M)
			a--, b += X;
		aa[i] = a, bb[i] = b;
	}
	the_lines_are(aa, bb);
}

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