Submission #1020967

#	Time	Username	Problem	Language	Result	Execution time	Memory
1020967		FIFI_cpp	XORanges (eJOI19_xoranges)	C++17	100 / 100	432 ms	20560 KiB

xoranges

#include <iostream>
#include <vector>
#include <algorithm>
#include <numeric>
#include <cstdlib>
#include <cmath>
#include <queue>
#include <stack>
#include <deque>
#include <fstream>
#include <iterator>
#include <set>
#include <map>
#include <unordered_map>
#include <iomanip>
#include <cctype>
#include <string>
#include <cassert>
#include <set>
#include <bitset>
#include <unordered_set>
using ll = int64_t;
#define pb push_back
#define all(a) a.begin(),a.end()
#define ppi pair<pair<int,int>,int>
#define fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define int int64_t
// xcode cant include bits/stdc++.h
using namespace std;
//ifstream fin ("sleepy.in");
//ofstream fout ("sleepy.out");
/*   /\_/\
*   (= ._.)
*   / >  \>
*/
// encouraging cat
//const int INF = 10000000000000000;
const int mod = 1000000007;
const int MAXN = 800010;
struct node
{
    int even,odd;
};
vector<pair<int,int>> t;
vector<int> a;
pair<int,int> merge(int v)
{
    t[v].first = t[v * 2].first ^ t[v * 2 + 1].first;
    t[v].second = t[v * 2].second ^ t[v * 2 + 1].second;
    return t[v];
}
void build(int v, int tl, int tr)
{
    if (tl == tr)
    {
        if (tl % 2 == 0)
        {
            t[v].first = a[tl];
            t[v].second = 0;
        }
        else
        {
            t[v].first = 0;
            t[v].second = a[tl];
        }
    }
    else
    {
        int tm = (tl + tr) / 2;
        build(v*2, tl, tm);
        build(v*2+1, tm+1, tr);
        merge(v);
    }
}
int query(int v, int tl, int tr, int l, int r,int p) {
    if (l > r)
        return 0;
    if (l == tl && r == tr)
    {
        if (p == 0)
            return t[v].first;
        return t[v].second;
    }
    int tm = (tl + tr) / 2;
    return query(v*2, tl, tm, l, min(r, tm),p)
           ^ query(v*2+1, tm+1, tr, max(l, tm+1), r,p);
}
void update(int v, int tl, int tr, int pos, int new_val) {
    if (tl == tr) {
        if (tr % 2 == 0)
            t[v].first = new_val;
        else
            t[v].second = new_val;
    } else {
        int tm = (tl + tr) / 2;
        if (pos <= tm)
            update(v*2, tl, tm, pos, new_val);
        else
            update(v*2+1, tm+1, tr, pos, new_val);
        merge(v);
    }
}

int32_t main() {
    int n,q;
    cin >> n >> q;
    a.resize(n);
    t.resize(MAXN);
    for (int i = 0;i < n;i++)
        cin >> a[i];
    build(1, 0, n - 1);
    while (q--)
    {
        int t;
        cin >> t;
        if (t == 1)
        {
            int i,v;
            cin >> i >> v;
            i--;
            a[i] = v;
            update(1, 0, n - 1, i, v);
        }
        else
        {
            int l,r;
            cin >> l >> r;
            l--;
            r--;
            if ((l - r + 1) % 2 == 0)
            {
                cout << 0 << '\n';
                continue;
            }
            else if (l - r + 1 == 2)
            {
                int cr = a[l];
                cr ^= a[r];
                cout << cr << '\n';
                continue;
            }
            cout << query(1, 0, n - 1, l, r,l % 2) << '\n';
        }
    }
    return 0;
}

Compilation message (stderr)

xoranges.cpp:32:9: warning: "/*" within comment [-Wcomment]
   32 | /*   /\_/\
      |

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