Submission #869828

#	Time	Username	Problem	Language	Result	Execution time	Memory
869828		rainboy	CONSUL (info1cup19_consul)	C++17	15 / 100	27 ms	684 KiB

consul

#include "grader.h"

const int N = 1000, Q = 50, Q_ = 10;

int min(int a, int b) { return a < b ? a : b; }

unsigned int X = 12345;

int rand_() {
	return (X *= 3) >> 1;
}

int *xx;

void sort(int *ii, int l, int r) {
	while (l < r) {
		int i = l, j = l, k = r, i_ = ii[l + rand_() % (r - l)], tmp;
		while (j < k)
			if (xx[ii[j]] == xx[i_])
				j++;
			else if (xx[ii[j]] < xx[i_]) {
				tmp = ii[i], ii[i] = ii[j], ii[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = ii[j], ii[j] = ii[k], ii[k] = tmp;
			}
		sort(ii, l, i);
		l = k;
	}
}

int aa[N], kk[N], ii[N];

void solve(int n) {
	for (int i = 0; i < n; i++)
		ii[i] = i;
	for (int i = 0; i < n; i++) {
		int j = rand_() % (i + 1), tmp;
		tmp = ii[i], ii[i] = ii[j], ii[j] = tmp;
	}
	int n_ = min(n, Q);
	for (int h = 0; h < n_; h++)
		aa[ii[h]] = kth(ii[h] + 1);
	xx = aa, sort(ii, 0, n_);
	if (n == n_) {
		for (int h = 0; h + n / 3 < n; h++)
			if (aa[ii[h]] == aa[ii[h + n / 3]]) {
				say_answer(aa[ii[h]]);
				return;
			}
	} else {
		int n1 = 0;
		for (int h = 0; h < n_; h++)
			if (n1 == 0 || aa[ii[n1 - 1]] != aa[ii[h]])
				kk[ii[n1++] = ii[h]] = 1;
			else
				kk[ii[n1 - 1]]++;
		xx = kk, sort(ii, 0, n1);
		for (int h = 0; h < n1 && h < Q_; h++)
			if (cnt(aa[ii[h]]) > n / 3) {
				say_answer(aa[ii[h]]);
				return;
			}
	}
	say_answer(-1);
}

• Subtask 1: 15 / 15
• Subtask 2: 0 / 20
• Subtask 3: 0 / 65