Submission #967625

#	Time	Username	Problem	Language	Result	Execution time	Memory
967625		vjudge1	XORanges (eJOI19_xoranges)	C++17	100 / 100	120 ms	20988 KiB

xoranges

#include <bits/stdc++.h>
using namespace std;

#define fii(i,a,b)      for(int i = a; i <= b; i++)
#define fid(i,a,b)      for(int i = a; i >= b; i--)
#define ll              long long
#define fi              first
#define se              second
#define pii             pair< int, int >
#define pll             pair< long long , long long >
#define sz(x)           int(x.size())
#define faster 	        ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL); 
#define maxn            1000005 
#define all(a)          a.begin(), a.end()
#define ins             insert
#define pb              push_back
#define Base            13
// #define int             long long
#define MOD             1000000007
#define endl            '\n'
#define fill(a,n)       memset(a, n, sizeof(a));
#define re              return
#define name            "file"
ll a[maxn];
ll Tc[4 * maxn], Tl[maxn * 4];
void build(int id, int l, int r)
{
    if(l == r)
    {
        if(l % 2 == 0) 
        {
            Tc[id] = a[l];
            Tl[id] = 0;
        }
        else
        {
            Tl[id] = a[l];
            Tc[id] = 0;
        }
        re;
    }
    int mid = (l + r) / 2;
    build(id * 2, l, mid);
    build(id * 2 + 1, mid + 1, r);
    Tc[id] = Tc[id * 2] ^ Tc[id * 2 + 1];
    Tl[id] = Tl[id * 2] ^ Tl[id * 2 + 1];
}

void update(int id, int l, int r, int pos, int w)
{
    if(l == r)
    {
        if(l % 2 == 0)
        {
            Tc[id] = w;
        }
        else Tl[id] = w;
        re;
    }
    int mid = (l + r) / 2;
    if(mid >= pos) update(id * 2, l, mid, pos, w);
    else update(id * 2 + 1, mid + 1, r, pos, w);
    Tc[id] = Tc[id * 2] ^ Tc[id * 2 + 1];
    Tl[id] = Tl[id * 2] ^ Tl[id * 2 + 1];
}

ll get_odd(int id, int l, int r, int u, int v)
{
    if(l > v || r < u) re 0;
    if(l >= u && r <= v)
    {
        return Tl[id];
    }
    int mid = (l + r) / 2;
    return get_odd(id * 2, l, mid, u, v) ^ get_odd(id * 2 + 1, mid + 1, r, u, v);
}
ll get_even(int id, int l, int r, int u, int v)
{
    if(l > v || r < u) re 0;
    if(l >= u && r <= v) re Tc[id];
    int mid = (l + r) / 2;
    return get_even(id * 2, l, mid, u, v) ^ get_even(id * 2 + 1, mid + 1, r, u, v);
}
int main(){
    
    if(fopen(name".INP","r")){
        freopen(name".INP", "r", stdin);
        freopen(name".OUT", "w", stdout);
    }
    faster
    int n, q;
    cin >> n >> q;
    fii(i, 1, n)
    {
        cin >> a[i];
    }
    build(1, 1, n);
    while(q--)
    {
        int t, u, v;
        cin >> t >> u >> v;
        if(t == 1)
        {
            update(1, 1, n, u, v);
        }
        else
        {
            if((v - u + 1) % 2 == 0) cout << 0 << '\n';
            else
            {
                if(u % 2 == 0) cout << get_even(1, 1, n, u, v);
                else cout << get_odd(1, 1, n, u, v);
                cout << endl;
            }
        }
    }
}

Compilation message (stderr)

xoranges.cpp: In function 'int main()':
xoranges.cpp:87:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   87 |         freopen(name".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
xoranges.cpp:88:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |         freopen(name".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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