Submission #589088

#	Time	Username	Problem	Language	Result	Execution time	Memory
589088		proma	XOR (IZhO12_xor)	C++17	0 / 100	1 ms	212 KiB

xor

#include <bits/stdc++.h>

using namespace std;

const int N = 250005;

int n, x, a[N], pref[N];

int main() {
/*
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
*/

    cin >> n >> x;

    pref[0] = 0;
    for (int i = 1; i <= n; i ++) {
        cin >> a[i];
        pref[i] = (pref[i-1] ^ a[i]);
    }

    int l = 1, r = n, i, k = -1;
    while (l <= r) {
        int m = (l + r) / 2;
        int flag = 0;
        for (int j = 1; j + m - 1 <= n; j ++) {
            if ((pref[j+m-1] ^ pref[j-1]) >= x) {
                i = j;
                k = m;
                flag = 1;
                l = m + 1;
                break;
            }
        }
        if (!flag) r = m - 1;
    }

    cout << i << " " << k;

    return 0;
}

Compilation message (stderr)

xor.cpp: In function 'int main()':
xor.cpp:39:18: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized]
   39 |     cout << i << " " << k;
      |                  ^~~

• Subtask 1: 0 / 100