Submission #947519

#	Time	Username	Problem	Language	Result	Execution time	Memory
947519		asdfghjk	XORanges (eJOI19_xoranges)	C++17	30 / 100	26 ms	604 KiB

xoranges

/// tree bends in youth
/// 24.01.2024
/// success is doing same thing in every single day!!!
#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define all(x) x.begin(), x.end()
#define F first
#define S second
using namespace std;
const ll N = 3e3 + 5;
const ll maxn =1e6 + 5;
const ll INF = 1e18;
const ll MOD = 1e9 + 7;
const ll LG = 18;
int a[N];
void solve(){
    int n,q;cin >> n >> q;
    if(max(n,q) <= 500){
        for(int i = 1;i <= n;i++){
            cin >> a[i];
        }
        while(q--){
            int tp;cin >> tp;
            if(tp == 1){
                int i,j;cin >> i >> j;
                a[i]  = j;
            }
            else{
                int l,r;cin >> l >> r;
                int ans = 0;
                for(int i = l;i <= r;i++){
                    int x = 0;
                    for(int j = i;j >= l;j--){
                        x = (x ^ a[j]);
                        ans = (ans ^ x);
                    }
                }
                cout << ans << '\n';
            }
        }
    }
    else if(max(n,q) <= 5000){
        for(int i = 1;i <= n;i++){
            cin >> a[i];
        }
        while(q--){
            int tp;cin >> tp;
            if(tp == 1){
                int i,j;cin >> i >> j;
                a[i] = j;
            }
            else{
                int l,r;cin >> l >> r;
                int ans = 0;
                for(int i = l;i <= r;i++){
                    int ql =(i -  l+ 1 );
                    int qr = (r - i + 1);
                    int res = (ql * qr);
                    if(res % 2 == 1){
                        ans=  (ans ^ a[i]);
                    }
                }
                cout << ans << '\n';
            }
        }
    }
}
main (){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

//    freopen("haybales.in","r",stdin);
//    freopen("haybales.out","w",stdout);
    ll abd= 1;
//    cin >> abd;
    for(ll i = 1;i <= abd;i++){
//        cout << "Case " << i << ":\n";
        solve();
    }
}

Compilation message (stderr)

xoranges.cpp:69:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   69 | main (){
      | ^~~~

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