Submission #571600

#	Time	Username	Problem	Language	Result	Execution time	Memory
571600		bojackduy	XOR (IZhO12_xor)	C++14	100 / 100	196 ms	59424 KiB

xor

#include<iostream>
#include<queue>
#include<stack>
#include<algorithm>
#include<string.h>
#define task 
#define size() size() * 1ll 
#define all(x) (x).begin(), (x).end()
#define allr(x, sz) (x) + 1, (x) + 1 + sz
#define pb push_back
#define pii pair<int,int>
#define fi first
#define se second
#define MASK(x) (1LL<<(x))
#define BIT(x,i) (((x)>>(i))&1)
#define numbit(x) __builtin_popcountll(x)

using namespace std;

const int N = 1e6 + 1;
const int M = 1e3 + 1;
const long long mod = 1e9 + 7;
const long long oo = 1e18 + 7;

typedef vector<int> vi;
typedef vector<pii> vii;
typedef long long ll;

template<class t>
bool mini(t &x,t y) {
    if (x > y) {
       x = y;
       return 1;
    }
return 0;
}
template<class t>
bool maxi(t &x,t y) {
    if (x < y) {
       x = y;
       return 1;
    }
return 0;
}
void file() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    //freopen(task.in, r, stdin);
    //freopen(task.out, w, stdout);
return ;
}
int n, g, msb;
int a[N];
struct node {
    int id;
    node *child[2];
    node() {
        id = mod;
        child[0] = child[1] = nullptr;
    }
}*root = new node();
void add(int x, int id) {
    node *p = root;
    for (int i = 29; i >= 0; i--) {
        if (p -> child[BIT(x, i)] == nullptr) p -> child[BIT(x, i)] = new node();
        p = p -> child[BIT(x, i)];
        mini(p -> id, id);
    }
}
int get(int x) {
    node *p = root;
    int l = mod;
    int val = 0;
    for (int i = 29; i >= 0; i--) {
        if (BIT(x, i)) {
            if (BIT(g, i)) {
                if (p -> child[0] == nullptr) return l;
                p = p -> child[0];
            } else {
                if (p -> child[0] != nullptr) mini(l, p -> child[0] -> id);
                if (p -> child[1] == nullptr) return l;
                p = p -> child[1];
            }
        } else {
            if (BIT(g, i)) {
                if(p -> child[1] == nullptr) return l;
                p = p -> child[1];
            } else {
                if (p -> child[1] != nullptr) mini(l, p -> child[1] -> id);
                if (p -> child[0] == nullptr) return l;
                p = p -> child[0];
            }
        }
    }
    mini(l, p -> id);
return l;
}

void solve(int test = -1) {
    cin >> n >> g;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        a[i] ^= a[i - 1];
    }
    int ans = 0;
    pii res = pii(0, 0);


    add(a[0], 0);
    for (int i = 1; i <= n; i++) {
        int l = get(a[i]);
        if (maxi(ans, i - l)) {
            res = pii(l + 1, i - l);
        }
        add(a[i], i);
    }
    cout << res.fi << ' ' << res.se;
}

int32_t main()  {
    file();
    int T = 1;
    // cin >> T;
    for (int i = 1; i <= T; i++) {
        solve(i);
    }
return 0;
}

Compilation message (stderr)

xor.cpp: In function 'int get(int)':
xor.cpp:74:9: warning: unused variable 'val' [-Wunused-variable]
   74 |     int val = 0;
      |         ^~~

• Subtask 1: 100 / 100