제출 #476238

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
476238		rainboy	Teoretičar (COCI18_teoreticar)	C11	130 / 130	2531 ms	26776 KiB

teoreticar

#include <stdio.h>
#include <stdlib.h>

#define N	200000
#define M	500000

int max(int a, int b) { return a > b ? a : b; }

int ii[M], jj[M], cc[M];
int *eh[N], eo[N], dd[N];

void dfs(int i) {
	int c = 1;

	while (eo[i]) {
		int h = eh[i][--eo[i]], j = i ^ ii[h] ^ jj[h];

		if (!cc[h])
			cc[h] = c ^= 3, dd[i]--, dd[j]--, i = j;
	}
}

void solve(int *hh, int m, int a, int b) {
	int mid, h, h_, h1, h2, i, j, tmp;

	if (m == 0)
		return;
	if (b - a == 1) {
		for (h = 0; h < m; h++)
			cc[hh[h]] = a;
		return;
	}
	mid = (a + b) / 2;
	for (h = 0; h < m; h++) {
		h_ = hh[h], i = ii[h_], j = jj[h_];
		eh[i][eo[i]++] = h_, eh[j][eo[j]++] = h_;
		dd[i]++, dd[j]++;
	}
	for (h = 0; h < m; h++) {
		h_ = hh[h], i = ii[h_], j = jj[h_];
		if (dd[i] % 2 == 1)
			dfs(i);
		if (dd[j] % 2 == 1)
			dfs(j);
	}
	for (h = 0; h < m; h++) {
		h_ = hh[h], i = ii[h_], j = jj[h_];
		if (dd[i] % 2 == 0)
			dfs(i);
		if (dd[j] % 2 == 0)
			dfs(j);
	}
	h1 = 0, h2 = m;
	while (h1 < h2) {
		int c = cc[hh[h1]];

		cc[hh[h1]] = 0;
		if (c == 1)
			h1++;
		else {
			h2--;
			tmp = hh[h1], hh[h1] = hh[h2], hh[h2] = tmp;
		}
	}
	solve(hh, h1, a, mid), solve(hh + h1, m - h1, mid, b);
}

int main() {
	static int hh[M];
	int n, n1, n2, m, h, i, j, d_;

	scanf("%d%d%d", &n1, &n2, &m), n = n1 + n2;
	for (h = 0; h < m; h++) {
		scanf("%d%d", &i, &j), i--, j--, j += n1;
		ii[h] = i, jj[h] = j;
		dd[i]++, dd[j]++;
	}
	d_ = 0;
	for (i = 0; i < n; i++) {
		eh[i] = (int *) malloc(dd[i] * sizeof *eh[i]);
		d_ = max(d_, dd[i]), dd[i] = 0;
	}
	while ((d_ & d_ - 1) != 0)
		d_++;
	for (h = 0; h < m; h++)
		hh[h] = h;
	solve(hh, m, 1, d_ + 1);
	printf("%d\n", d_);
	for (h = 0; h < m; h++)
		printf("%d\n", cc[h]);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

teoreticar.c: In function 'main':
teoreticar.c:83:18: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   83 |  while ((d_ & d_ - 1) != 0)
      |               ~~~^~~
teoreticar.c:72:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |  scanf("%d%d%d", &n1, &n2, &m), n = n1 + n2;
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
teoreticar.c:74:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |   scanf("%d%d", &i, &j), i--, j--, j += n1;
      |   ^~~~~~~~~~~~~~~~~~~~~

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