Submission #1246305

#	Time	Username	Problem	Language	Result	Execution time	Memory
1246305		trinm01	XORanges (eJOI19_xoranges)	C++20	100 / 100	114 ms	9824 KiB

xoranges

//  #pragma GCC optimize("O3")
//  #pragma GCC optimization("Ofast,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzd,popd")
#include <bits/stdc++.h>
using namespace std;

#define int long long 
#define ll long long
#define FOR(i, l, r) for (int i = (l); i <= (r); i++)
#define FOD(i, r, l) for (int i = (r); i >= (l); i--)
#define fi first
#define se second
#define pii pair<int, int>

const ll mod = 1e9+7;
const int MAXN = 2e5 + 5;
const int oo = 1e18 + 7;
const ll base = 320;  

int n, q;
struct segtree{
    int st[4*MAXN];
    void update(int id, int l, int r, int i, int val){
        if(l>i || r<i){
            return;
        }
        if(l>=r){
            st[id]=val;
            return;
        }
        int mid=(l+r)/2;
        update(id*2, l, mid, i, val);
        update(id*2+1, mid+1, r, i, val);
        st[id]=st[id*2]^st[id*2+1];
    }
    int get(int id, int l, int r, int i, int j){
        if(l>j || r<i){
            return 0;
        }
        if(l>=i && r<=j){
            return  st[id];
        }
        int mid=(l+r)/2;
        return get(id*2, l, mid, i, j)^get(id*2+1, mid+1, r, i, j);
    }
}T[2];

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);   

    //   freopen("test.txt", "r", stdin);
    //    freopen("o2.out", "w", stdout);
    if(fopen(".INP", "r")){
        freopen(".INP", "r", stdin);
        freopen(".OUT", "w", stdout);
    }

    cin >> n >> q;
    FOR(i, 1, n){
        int x;
        cin >> x;
        T[i%2].update(1, 1, n, i, x);
        T[(i+1)%2].update(1, 1, n, i, 0);
    }
    while(q--){
        int t;
        cin >> t;
        if(t==1){
            int i, val;
            cin >> i >> val;         
            T[i%2].update(1, 1, n, i, val);
        }
        else{
            int l, r;
            cin >> l >> r;
            if((r-l+1)%2==1){
                cout << T[l%2].get(1, 1, n, l, r);
            }
            else{
                cout << 0;
            }
            cout << '\n';
        }
    }

    return 0;
}

Compilation message (stderr)

xoranges.cpp: In function 'int main()':
xoranges.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         freopen(".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
xoranges.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         freopen(".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

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