oj.uz

답안 #330922

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
330922 2020-11-26T21:52:24 Z ZwariowanyMarcin XOR (IZhO12_xor) C++14
100 / 100
 167 ms 23532 KB 
#include <bits/stdc++.h>
#define pb push_back
#define fi first
#define se second
#define sz(x) (int)x.size()

using ll = long long;
using namespace std;

const int M = 8000000;

int n, q, a, b, cnt, to[M][2], mn[M];
pair<int, int> res;

void add(int pos, int x) {
	int v = 0;
	for (int i = 30; 0 <= i; --i) {
		int b = (x >> i & 1);
		if (!to[v][b]) to[v][b] = ++cnt, mn[cnt] = 1 << 30;
		v = to[v][b];
		mn[v] = min(mn[v], pos);
	}
}

int query(int x) {
	int v = 0, res = 1 << 30;
	for (int i = 30; 0 <= i; --i) {
		int b = (x >> i & 1);
		if (q >> i & 1) 
			v = to[v][!b];
		else {
			res = min(res, mn[to[v][!b]]);
			v = to[v][b];
		}
		if (!v) return res;
	}
	res = min(res, mn[v]);
	return res;
}			

int main() {
	//~ memset(mn, 0x3f, sizeof mn);
	mn[0] = 1 << 30;
	scanf("%d%d", &n, &q);
	add(0, 0);
	for (int i = 1; i <= n; ++i) {
		scanf("%d", &a);
		b ^= a;
		int l = query(b);
		res = max(res, {i - l, -l});
		add(i, b);
	}
	printf("%d %d\n", -res.second + 1, res.first);
	return 0;
}

Compilation message

xor.cpp: In function 'int main()':
xor.cpp:44:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 |  scanf("%d%d", &n, &q);
      |  ~~~~~^~~~~~~~~~~~~~~~
xor.cpp:47:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   47 |   scanf("%d", &a);
      |   ~~~~~^~~~~~~~~~

Subtask #1
100.0 / 100.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 7 ms 1004 KB Output is correct
6 Correct 9 ms 1132 KB Output is correct
7 Correct 9 ms 1132 KB Output is correct
8 Correct 13 ms 1132 KB Output is correct
9 Correct 50 ms 10988 KB Output is correct
10 Correct 50 ms 11116 KB Output is correct
11 Correct 49 ms 11116 KB Output is correct
12 Correct 51 ms 11116 KB Output is correct
13 Correct 52 ms 11116 KB Output is correct
14 Correct 52 ms 11244 KB Output is correct
15 Correct 52 ms 11116 KB Output is correct
16 Correct 50 ms 11116 KB Output is correct
17 Correct 161 ms 23276 KB Output is correct
18 Correct 151 ms 23512 KB Output is correct
19 Correct 146 ms 23408 KB Output is correct
20 Correct 167 ms 23532 KB Output is correct