Submission #1020838

#	Time	Username	Problem	Language	Result	Execution time	Memory
1020838		FIFI_cpp	XORanges (eJOI19_xoranges)	C++17	55 / 100	1076 ms	5712 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;
int32_t main() {
    int n,q;
    cin >> n >> q;
    vector<int> a(n);
    for (int i = 0;i < n;i++)
        cin >> a[i];
    bool ok = true;
    for (int i = 0;i < n;i++)
    {
        if (a[i] != i + 1)
            ok = false;
    }
    assert(!ok);
    while (q--)
    {
        int t;
        cin >> t;
        if (t == 1)
        {
            int i,v;
            cin >> i >> v;
            i--;
            a[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;
            }
            int res = 0;
            for (int i = l;i <= r;i += 2)
            {
                res ^= a[i];
            }
            cout << res << '\n';
        }
    }
    return 0;
}

Compilation message (stderr)

xoranges.cpp:32:9: warning: "/*" within comment [-Wcomment]
   32 | /*   /\_/\
      |          
xoranges.cpp:37:17: warning: overflow in conversion from 'long int' to 'int' changes value from '10000000000000000' to '1874919424' [-Woverflow]
   37 | const int INF = 10000000000000000;
      |                 ^~~~~~~~~~~~~~~~~

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