제출 #823863

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
823863		rainboy	Travelling Trader (CCO23_day2problem2)	C11	2 / 25	136 ms	33484 KiB

Main

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

#define N	200000

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

int *ej[N], eo[N], ww[N];

void append(int i, int j) {
	int o = eo[i]++;

	if (o >= 2 && (o & o - 1) == 0)
		ej[i] = (int *) realloc(ej[i], o * 2 * sizeof *ej[i]);
	ej[i][o] = j;
}

long long dp[N];

void dfs(int p, int i) {
	int o;

	dp[i] = 0;
	for (o = eo[i]; o--; ) {
		int j = ej[i][o];

		if (j != p) {
			dfs(i, j);
			dp[i] = max(dp[i], dp[j]);
		}
	}
	dp[i] += ww[i];
}

int main() {
	static int qu[N];
	int n, k, cnt, h, i, j, p, o;

	scanf("%d%d", &n, &k);
	for (i = 0; i < n; i++)
		ej[i] = (int *) malloc(2 * sizeof *ej[i]);
	for (h = 0; h < n - 1; h++) {
		scanf("%d%d", &i, &j), i--, j--;
		append(i, j), append(j, i);
	}
	for (i = 0; i < n; i++)
		scanf("%d", &ww[i]);
	if (k == 1) {
		dfs(-1, 0);
		p = -1, i = 0, cnt = 0;
		while (1) {
			qu[cnt++] = i;
			for (o = eo[i]; o--; ) {
				j = ej[i][o];
				if (j != p && dp[i] == dp[j] + ww[i]) {
					i = j;
					break;
				}
			}
			if (o < 0)
				break;
		}
		printf("%lld\n", dp[0]);
		printf("%d\n", cnt);
		for (h = 0; h < cnt; h++)
			printf("%d ", qu[h] + 1);
		printf("\n");
	}
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

Main.c: In function 'append':
Main.c:13:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   13 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
Main.c: In function 'main':
Main.c:39:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |  scanf("%d%d", &n, &k);
      |  ^~~~~~~~~~~~~~~~~~~~~
Main.c:43:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~
Main.c:47:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |   scanf("%d", &ww[i]);
      |   ^~~~~~~~~~~~~~~~~~~

• Subtask 1: 2 / 2
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