Submission #38648

#	Time	Username	Problem	Language	Result	Execution time	Memory
38648		14kg	Game (IOI14_game)	C++11	42 / 100	1000 ms	20236 KiB

game

#include "game.h"
#include <vector>
#include <queue>
#define N 1501

using namespace std;
int n, r[N][N], r_cnt[N];
int d[N];
vector<int> link[N];
queue<int> Q;

int d1_len, d1[N], d2_len, d2[N];

void initialize(int _n) {
	n = _n;
	for (int i = 1; i < n; i++) {
		r[i][i + 1] = r[i + 1][i] = 1;
		link[i].push_back(i + 1), link[i + 1].push_back(i);
		r_cnt[i]++, r_cnt[i + 1]++;
	}
}

int hasEdge(int x, int y) {
	int lev, empty_num1 = 0, empty_num2 = 0;

	x++, y++;
	if (r[x][y] == 0) {
		r[x][y] = r[y][x] = -2;
		r_cnt[x]++, r_cnt[y]++;
		return 0;
	}
	if (r[x][y] != 1) return r[x][y] > 0 ? 1 : 0;

	for (int i = 1; i <= n; i++) d[i] = 2;
	
	d[x] = 1, Q.push(x);
	while (!Q.empty()) {
		lev = Q.front(), Q.pop();

		for (auto i : link[lev])
			if (d[i] == 2 && i != y && (r[lev][i] == 1 || r[lev][i] == 2))
				d[i] = 1, Q.push(i);
	}

	// !!!
	d1_len = d2_len = 0;
	for (int i = 1; i <= n; i++)
		if (d[i] == 1 && r_cnt[i] < n - 1) d1[++d1_len] = i;
		else if (d[i] == 2 && r_cnt[i] < n - 1) d2[++d2_len] = i;

	for(int i=1; i<=d1_len && empty_num1==0; i++)
		for (int j = 1; j <= d2_len && empty_num1==0; j++)
			if ((d1[i] == x && d2[j] == y) == false && r[d1[i]][d2[j]] != -2) {
				empty_num1 = d1[i], empty_num2 = d2[j];
			}

	if (empty_num1 && empty_num2) {
		int tx = empty_num1, ty = empty_num2;

		r[x][y] = r[y][x] = -2;
		r[tx][ty] = r[ty][tx] = 1;
		link[tx].push_back(ty), link[ty].push_back(tx);
		r_cnt[tx]++, r_cnt[ty]++;
		return 0;
	}
	else {
		r[x][y] = r[y][x] = 2;
		return 1;
	}
}

• Subtask 1: 15 / 15
• Subtask 2: 27 / 27
• Subtask 3: 0 / 58