oj.uz

Submission #775429

# Submission time Handle Problem Language Result Execution time Memory
775429 2023-07-06T11:35:11 Z SalihSahin XORanges (eJOI19_xoranges) C++17
55 / 100
 1000 ms 23284 KB 
#include <bits/stdc++.h>
#define pb push_back
#define int long long
#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 = 1e18 + 7;


struct SegT{
  vector<int> tree;

  void init(int n){
    tree.resize(n*4);
    fill(tree.begin(), tree.end(), 0);
  }

  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);
  }

  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];
    }
  }
};

int32_t 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;
       // cout<<endl;
       // cout<<segodd.query(1, 0, odd.size()-1, 0, odd.size()-1)<<endl;
       // cout<<segeven.query(1, 0, even.size()-1, 0, even.size()-1)<<endl;
       // cout<<endl;
    }
  }

  return 0;
}

Subtask #1
12.0 / 12.0

# 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 #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Correct 1 ms 328 KB Output is correct
5 Correct 1 ms 340 KB Output is correct

Subtask #3
25.0 / 25.0

# 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
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 1 ms 328 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 12 ms 952 KB Output is correct
12 Correct 12 ms 948 KB Output is correct
13 Correct 14 ms 932 KB Output is correct
14 Correct 14 ms 932 KB Output is correct

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1074 ms 23284 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 25.0

# 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
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 1 ms 328 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 12 ms 952 KB Output is correct
12 Correct 12 ms 948 KB Output is correct
13 Correct 14 ms 932 KB Output is correct
14 Correct 14 ms 932 KB Output is correct
15 Execution timed out 1074 ms 23284 KB Time limit exceeded
16 Halted 0 ms 0 KB -