Submission #466784

#	Time	Username	Problem	Language	Result	Execution time	Memory
466784		mtxas	XORanges (eJOI19_xoranges)	C++14	100 / 100	138 ms	14144 KiB

xoranges

#include <bits/stdc++.h>

#define ll long long
#define pii pair<int, int>
#define fi first
#define se second
#define pll pair<ll, ll>
#define mii map<int, int>
#define vi vector<int>
#define vll vector<ll>
#define pb push_back
#define all(a) a.begin(), a.end()
#define sz(x) ((int)x.size())
#define turbo() cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(false)
#define _fre() freopen("input.txt", "r", stdin)
#define _for(a, b, c) for(int (a) = (b); (a) < (c); (a)++)
#define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
#define _forneq(a, b, c) for(int (a) = (b); (a) >= (c); (a)--)
#define _forn(a, b, c) for(int (a) = (b); (a) > (c); (a)--)
using namespace std;
/**********************************************************************************
                                STRUCTS
**********************************************************************************/

/**********************************************************************************
                               VARIABLES
**********************************************************************************/
#define int ll
const int maxn = 2e5+2;
int a[maxn];
int t[maxn<<1][2];
int N;
/**********************************************************************************
                               FUNCTIONS
**********************************************************************************/
void upd(int p, int val){
    int k = p%2;
    for(t[p+=N][k] = val; p>1; p>>=1){
        t[p>>1][k] = t[p][k] ^ t[p^1][k];
    }
}
int query(int l, int r, int k){
    int ans = 0; r++;
    for(l+=N, r+=N; l<r; r>>=1, l>>=1){
        if(r&1) ans^= t[--r][k];
        if(l&1) ans^= t[l++][k];
    }
    return ans;
}
/**********************************************************************************
                                 MAIN
**********************************************************************************/
signed main(){
   // _fre();
    turbo();
    int n, q; cin>>n>>q; N = n+1;
    _foreq(i, 1, n) cin>>a[i], upd(i, a[i]);
    _for(g, 0, q){
        int type; cin>>type;
        if(type == 1){
            int i, val; cin>>i>>val;
            upd(i, val);
            //cout<<"a["<<i<<"] = "<<val<<endl;
        }
        else if(type == 2){
            int l, r; cin>>l>>r;
           // cout<<"query("<<l<<", "<<r<<")\n";
            if((l&1) != (r&1)) cout<<0<<'\n';
            else cout<<query(l, r, l&1)<<'\n';
        }
    }
}

Compilation message (stderr)

xoranges.cpp: In function 'int main()':
xoranges.cpp:17:33: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   17 | #define _foreq(a, b, c) for(int (a) = (b); (a) <= (c); (a)++)
      |                                 ^
xoranges.cpp:57:5: note: in expansion of macro '_foreq'
   57 |     _foreq(i, 1, n) cin>>a[i], upd(i, a[i]);
      |     ^~~~~~
xoranges.cpp:16:31: warning: unnecessary parentheses in declaration of 'g' [-Wparentheses]
   16 | #define _for(a, b, c) for(int (a) = (b); (a) < (c); (a)++)
      |                               ^
xoranges.cpp:58:5: note: in expansion of macro '_for'
   58 |     _for(g, 0, q){
      |     ^~~~

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