oj.uz

Submission #418450

# Submission time Handle Problem Language Result Execution time Memory
418450 2021-06-05T11:29:39 Z Runtime_error_ XOR (IZhO12_xor) C++14
100 / 100
 264 ms 90356 KB 
#include <bits/stdc++.h>
#define mp make_pair
#define ll long long
using namespace std;
const int inf = 25e4+9,lg = 32;
ll n,k,a[inf],pre[inf];
pair<ll,ll> ans;

struct Trie{
    ll cnt = 0,MinIdx = inf;
    Trie *a[2] = {0};
    Trie(){
        cnt = 0,MinIdx = inf;
        a[0] = a[1] = NULL;
    }
    void insert(ll bit,ll num,ll idx){
        cnt++;
        MinIdx = min(MinIdx,idx);
        if(bit == -1)
            return ;
        bool CurBit = num & (1ll<<bit);

        if(a[CurBit] == NULL)
            a[CurBit] = new Trie();
        a[CurBit]->insert(bit-1,num,idx);
    }
    ll query(ll bit,ll PreXor){

        if(cnt == 0 || bit == -1)
            return MinIdx;
        bool PreBit = PreXor & (1ll<<bit);
        bool KBit = k & (1ll<<bit);
        if(a[0] == NULL)
            a[0] = new Trie();
        if(a[1] == NULL)
            a[1] = new Trie();
        if(KBit == 0){
            if(PreBit)
                return min(a[1]->query(bit-1,PreXor),a[0]->MinIdx);
            else
                return min(a[0]->query(bit-1,PreXor),a[1]->MinIdx);
        }
        else {
            if(PreBit)
                return a[0]->query(bit-1,PreXor);
            else
                return a[1]->query(bit-1,PreXor);
        }
    }
};
Trie *root = new Trie();

signed main(){
    scanf("%lld%lld",&n,&k);
    for(ll i=1;i<=n;i++){
        scanf("%lld",a+i);
        pre[i] = pre[i-1]^a[i];
        root->insert(lg,pre[i-1],i-1);
        ans = max(ans,mp(i - root->query(lg,pre[i]),-i));
    }
    assert(ans.first > 0 );
    printf("%lld %lld\n",-ans.second-ans.first+1,ans.first);
}

Compilation message

xor.cpp: In function 'int main()':
xor.cpp:55:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |     scanf("%lld%lld",&n,&k);
      |     ~~~~~^~~~~~~~~~~~~~~~~~
xor.cpp:57:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |         scanf("%lld",a+i);
      |         ~~~~~^~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 588 KB Output is correct
5 Correct 10 ms 2636 KB Output is correct
6 Correct 13 ms 3148 KB Output is correct
7 Correct 14 ms 3276 KB Output is correct
8 Correct 22 ms 3412 KB Output is correct
9 Correct 95 ms 42256 KB Output is correct
10 Correct 101 ms 42436 KB Output is correct
11 Correct 136 ms 42224 KB Output is correct
12 Correct 97 ms 42276 KB Output is correct
13 Correct 105 ms 42440 KB Output is correct
14 Correct 103 ms 42464 KB Output is correct
15 Correct 106 ms 42516 KB Output is correct
16 Correct 100 ms 42264 KB Output is correct
17 Correct 262 ms 90272 KB Output is correct
18 Correct 258 ms 90320 KB Output is correct
19 Correct 264 ms 90356 KB Output is correct
20 Correct 262 ms 90268 KB Output is correct