Submission #1325922

#	Time	Username	Problem	Language	Result	Execution time	Memory
1325922		djsksbrbf	XORanges (eJOI19_xoranges)	C++20	55 / 100	1095 ms	3052 KiB

xoranges

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pii;
#define fi first
#define se second
#define pb push_back
const int MOD = 1e9 + 7;
const int MAX = 2e5 + 5;
#define int ll

signed main(){
   ios_base::sync_with_stdio(0);
   cin.tie(0);
   
   int n, q; cin >> n >> q;
   int a[n + 5];
   for(int i = 1 ; i <= n ; i++)cin >> a[i];
   
   while(q--){
      int op, x, y; cin >> op >>x >> y;
      if(op == 1){
         a[x] = y;
      }
      else{
         int l = x, r = y;
         
         if((r - l + 1) % 2){
            int ans = 0;
            for(int i = l ; i <= r ; i += 2){
               ans ^= a[i];
            }
            cout << ans << '\n';
         }
         else cout << 0 << '\n';
      }
   }
   
   return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 18 / 18
• Subtask 3: 25 / 25
• Subtask 4: 0 / 20
• Subtask 5: 0 / 25