제출 #477025

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
477025		rainboy	Deblo (COCI18_deblo)	C11	90 / 90	73 ms	23660 KiB

deblo

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

#define N	100000
#define L	22

int *ej[N], eo[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;
}

int aa[N], kk[N][L], sz[N]; long long ans;

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

	for (l = 0; l < L; l++)
		kk[i][l] = (aa[i] & 1 << l) == 0 ? 0 : 1;
	sz[i] = 1;
	ans += aa[i];
	for (o = eo[i]; o--; ) {
		int j = ej[i][o];

		if (j != p) {
			dfs(i, j);
			for (l = 0; l < L; l++)
				ans += (long long) kk[i][l] * (sz[j] - kk[j][l]) + (long long) (sz[i] - kk[i][l]) * kk[j][l] << l;
			for (l = 0; l < L; l++)
				kk[i][l] += (aa[i] & 1 << l) == 0 ? kk[j][l] : sz[j] - kk[j][l];
			sz[i] += sz[j];
		}
	}
}

int main() {
	int n, h, i, j;

	scanf("%d", &n);
	for (i = 0; i < n; i++) {
		scanf("%d", &aa[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);
	}
	dfs(-1, 0);
	printf("%lld\n", ans);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

deblo.c: In function 'append':
deblo.c:12:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   12 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
deblo.c: In function 'dfs':
deblo.c:32:54: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   32 |     ans += (long long) kk[i][l] * (sz[j] - kk[j][l]) + (long long) (sz[i] - kk[i][l]) * kk[j][l] << l;
      |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
deblo.c: In function 'main':
deblo.c:43:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
deblo.c:45:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~
deblo.c:49:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 90 / 90