Submission #481411

#	Time	Username	Problem	Language	Result	Execution time	Memory
481411		rainboy	Klasika (COCI20_klasika)	C11	66 / 110	5051 ms	29144 KiB

klasika

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

#define N	200001
#define L	30
#define N_	(1 + N * L)

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

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

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

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

int aa[N];

int dfs(int i, int a) {
	int x = aa[i] ^ a, o;

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

		x = max(x, dfs(j, a));
	}
	return x;
}

int tt[N_][2], _ = 2;

void update(int a) {
	int l, t;

	for (l = L - 1, t = 1; l >= 0; l--) {
		int c = a >> l & 1;

		if (!tt[t][c])
			tt[t][c] = _++;
		t = tt[t][c];
	}
}

int query(int a) {
	int l, t, x;

	x = 0;
	for (l = L - 1, t = 1; l >= 0; l--) {
		int c = (a >> l & 1) ^ 1;

		if (tt[t][c])
			x |= 1 << l;
		else
			c ^= 1;
		t = tt[t][c];
	}
	return x;
}

int main() {
	int n, q;

	scanf("%d", &q);
	n = 1;
	update(aa[0]);
	while (q--) {
		static char s[8];
		int i, j;

		scanf("%s%d", s, &i), i--;
		if (s[0] == 'A') {
			j = n++;
			scanf("%d", &aa[j]), aa[j] ^= aa[i];
			append(i, j);
			update(aa[j]);
		} else {
			scanf("%d", &j), j--;
			printf("%d\n", j == 0 ? query(aa[i]) : dfs(j, aa[i]));
		}
	}
	return 0;
}

Compilation message (stderr)

klasika.c: In function 'append':
klasika.c:15:33: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   15 |  if (o == 0 || o >= 2 && (o & o - 1) == 0)
      |                               ~~^~~
klasika.c:15:23: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   15 |  if (o == 0 || o >= 2 && (o & o - 1) == 0)
      |                ~~~~~~~^~~~~~~~~~~~~~~~~~~
klasika.c: In function 'main':
klasika.c:66:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |  scanf("%d", &q);
      |  ^~~~~~~~~~~~~~~
klasika.c:73:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |   scanf("%s%d", s, &i), i--;
      |   ^~~~~~~~~~~~~~~~~~~~
klasika.c:76:4: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |    scanf("%d", &aa[j]), aa[j] ^= aa[i];
      |    ^~~~~~~~~~~~~~~~~~~
klasika.c:80:4: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |    scanf("%d", &j), j--;
      |    ^~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 22 / 22
• Subtask 3: 33 / 33
• Subtask 4: 0 / 44