oj.uz

Submission #775452

# Submission time Handle Problem Language Result Execution time Memory
775452 2023-07-06T11:55:29 Z SalihSahin XORanges (eJOI19_xoranges) C++14
100 / 100
 300 ms 11188 KB 
#include <bits/stdc++.h>
#define pb push_back
#define fastio cin.tie(0); ios_base::sync_with_stdio(false); cout.tie(0)
using namespace std;

const int N = 5e3 + 10;
const int mod = 1e9 + 7;
const int inf = 1e9*2;


struct SegT{
  vector<int> tree;

  void init(int n){
    tree.resize(n*4);
  }

  void build(vector<int> &a, int v, int tl, int tr){
    if(tl == tr) tree[v] = a[tl];
    else{
        int tm = (tl + tr)/2;
        build(a, v*2, tl, tm);
        build(a, v*2+1, tm+1, tr);
        tree[v] = tree[v*2] ^ tree[v*2+1];
    }
  }

  int query(int v, int tl, int tr, int l, int r){
    if(l > r) return 0;
    if(l <= tl && r >= tr) return tree[v];
    int tm = (tl + tr)/2;
    return query(v*2, tl, tm, l, min(tm, r)) ^ query(v*2+1, tm+1, tr, max(l, tm+1), r);
    //return query(v*2, tl, tm, l, r) ^ query(v*2+1, tm+1, tr, l, r);
  }

  void update(int v, int tl, int tr, int pos, int val){
    if(tl == tr) tree[v] = val;
    else{
        int tm = (tl + tr)/2;

        if(pos <= tm){
            update(v*2, tl, tm, pos, val);
        }
        else update(v*2+1, tm+1, tr, pos, val);

        tree[v] = tree[v*2] ^ tree[v*2+1];
    }
  }
};

int main(){
  fastio;
  SegT segeven, segodd;
  int n, q;
  cin>>n>>q;
  vector<int> a(n);
  vector<int> odd, even;
  for(int i = 0; i < n; i++){
    cin>>a[i];
    if(i%2) odd.pb(a[i]);
    else even.pb(a[i]);
  }
  segeven.init(even.size());
  segeven.build(even, 1, 0, even.size()-1);

  segodd.init(odd.size());
  segodd.build(odd, 1, 0, odd.size()-1);

  while(q--){
    int x;
    cin>>x;
    if(x == 1){
        int i, nv;
        cin>>i>>nv;
        i--;

        if(i%2) segodd.update(1, 0, odd.size()-1, i/2, nv);
        else segeven.update(1, 0, even.size()-1, i/2, nv);
    }
    else{
        int l, u;
        cin>>l>>u;
        l--, u--;

        if((u-l+1)%2){
            int ql = l/2, qu = u/2;
            if(l&1) cout<<segodd.query(1, 0, odd.size()-1, ql, qu)<<endl;
            else cout<<segeven.query(1, 0, even.size()-1, ql, qu)<<endl;
        }
        else cout<<0<<endl;
    }
  }

  return 0;
}

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 5 ms 468 KB Output is correct
12 Correct 5 ms 468 KB Output is correct
13 Correct 7 ms 468 KB Output is correct
14 Correct 7 ms 468 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 300 ms 9096 KB Output is correct
2 Correct 296 ms 11188 KB Output is correct
3 Correct 293 ms 11180 KB Output is correct
4 Correct 285 ms 10860 KB Output is correct
5 Correct 287 ms 10880 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 5 ms 468 KB Output is correct
12 Correct 5 ms 468 KB Output is correct
13 Correct 7 ms 468 KB Output is correct
14 Correct 7 ms 468 KB Output is correct
15 Correct 300 ms 9096 KB Output is correct
16 Correct 296 ms 11188 KB Output is correct
17 Correct 293 ms 11180 KB Output is correct
18 Correct 285 ms 10860 KB Output is correct
19 Correct 287 ms 10880 KB Output is correct
20 Correct 190 ms 10996 KB Output is correct
21 Correct 193 ms 10932 KB Output is correct
22 Correct 189 ms 10904 KB Output is correct
23 Correct 268 ms 10928 KB Output is correct
24 Correct 295 ms 10880 KB Output is correct