Submission #553965

#	Time	Username	Problem	Language	Result	Execution time	Memory
553965		Fidan	XORanges (eJOI19_xoranges)	C++17	20 / 100	522 ms	11060 KiB

xoranges

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
const ll inf=(1e18);
const ll N=1'000'010;

void upd(ll id, ll val, vector<ll> &fen){
	id++;
	while(id<=fen.size()){
		fen[id]=(fen[id]^val);
		id+=id&(-id);
	}
}

ll que(ll id, vector<ll> &fen){
	id++;
	ll s=0;
	while(id>0){
		s=(s^fen[id]);
		id-=id&(-id);
	}
	return s;
}

int main(){
	
	ll n, q, i;
	cin>>n>>q;
	
	vector<ll> v(n+1, 0);
	vector<ll> a1(n+1, 0);
	vector<ll> a2(n+1, 0);
	
	for(i=1; i<=n; i++){
		cin>>v[i];
	}
	for(i=1; i<=n; i++){
		if(i%2==0) upd(i, v[i], a2);
		else upd(i, v[i], a1);
	}
	
	while(q--){
		ll t;
		cin>>t;
		if(t==1){
			ll a, b;
			cin>>a>>b;
			if(a%2==0){
				upd(a, (v[a]^b), a2);
			}
			else{
				upd(a, (v[a]^b), a1);
			}
			v[a]=b;
		}
		else {
			ll l, r;
			cin>>l>>r;
			if((r-l)%2==1) cout<<0<<endl;
			else {
				ll s=0;
				if(l%2==0) s=(que(r, a2)^que(l-1, a2));
				else s=(que(r, a1)^que(l-1, a1));
				cout<<s<<endl;
			}
		}		
	}
	
	return 0;
}

Compilation message (stderr)

xoranges.cpp: In function 'void upd(ll, ll, std::vector<long long int>&)':
xoranges.cpp:10:10: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |  while(id<=fen.size()){
      |        ~~^~~~~~~~~~~~

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