oj.uz

Submission #775455

# Submission time Handle Problem Language Result Execution time Memory
775455 2023-07-06T11:57:33 Z SalihSahin XORanges (eJOI19_xoranges) C++14
100 / 100
 295 ms 6468 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 1 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 2 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 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 2 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 480 KB Output is correct
13 Correct 7 ms 492 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 288 ms 6380 KB Output is correct
2 Correct 295 ms 6420 KB Output is correct
3 Correct 290 ms 6376 KB Output is correct
4 Correct 292 ms 6468 KB Output is correct
5 Correct 277 ms 6444 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 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 2 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 480 KB Output is correct
13 Correct 7 ms 492 KB Output is correct
14 Correct 7 ms 468 KB Output is correct
15 Correct 288 ms 6380 KB Output is correct
16 Correct 295 ms 6420 KB Output is correct
17 Correct 290 ms 6376 KB Output is correct
18 Correct 292 ms 6468 KB Output is correct
19 Correct 277 ms 6444 KB Output is correct
20 Correct 187 ms 5804 KB Output is correct
21 Correct 183 ms 5724 KB Output is correct
22 Correct 182 ms 5740 KB Output is correct
23 Correct 268 ms 6336 KB Output is correct
24 Correct 268 ms 6284 KB Output is correct