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Submission #408906

# Submission time Handle Problem Language Result Execution time Memory
408906 2021-05-19T19:17:15 Z rainboy Hotter Colder (IOI10_hottercolder) C
0 / 100
 596 ms 8080 KB 
#include "grader.h"

int HC(int n) {
	int lower_, lower, upper, g, x;

	while (1) {
		if (n == 1)
			return 1;
		if (n == 2) {
			Guess(1);
			return Guess(2) < 0 ? 1 : 2;
		}
		if (n == 3) {
			Guess(1);
			if (Guess(2) < 0)
				return 1;
			if (Guess(3) < 0)
				return 2;
			return 3;
		}
		Guess(1);
		g = Guess(n / 2);
		if (g == 0)
			return (1 + n / 2) / 2;
		if (g > 0)
			break;
		n /= 4;
	}
	lower_ = (1 + n / 2) / 2 + 1;
	lower = n / 2, upper = n;
	while (lower < upper) {
		int mid = (lower + 1 + upper) / 2;

		g = Guess(mid);
		if (g == 0)
			return (lower + mid) / 2;
		if (g > 0)
			lower_ = (lower + mid) / 2 + 1, lower = mid;
		else {
			upper = (lower + mid - 1) / 2, lower = lower_, x = mid;
			while (lower < upper) {
				mid = (lower + upper) / 2;
				if (mid * 2 - x <= 0 || mid * 2 - x > n) {
					if (lower > 1)
						Guess(lower - 1), x = lower - 1;
					else
						Guess(upper + 1), x = upper + 1;
				}
				g = Guess(mid * 2 - x);
				if (g == 0)
					return mid;
				else if ((g > 0) == (x < mid * 2 - x))
					lower = mid + 1;
				else
					upper = mid - 1;
				x = mid * 2 - x;
			}
			return lower;
		}
	}
	return n;
}

Subtask #1
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 24 ms 1228 KB Output isn't correct

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 21 ms 1268 KB Output isn't correct

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 24 ms 1264 KB Output isn't correct

Subtask #4
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 596 ms 8080 KB Output isn't correct - alpha = 0.000000000000