Submission #787146

#	Time	Username	Problem	Language	Result	Execution time	Memory
787146		ThylOne	XORanges (eJOI19_xoranges)	C++14	0 / 100	1056 ms	2140 KiB

xoranges

#include<bits/stdc++.h>

using namespace std;
#define int long long
signed main(){
	int n;cin>>n;
	int q;cin>>q;
	vector<int> nums(n);
	for(int i = 0 ; i < n ; i++){
		cin>>nums[i];
	}
	for(int _=0;_<q;_++){
		int type;cin>>type;
		if(type==1){
			int pos;cin>>pos;pos--;
			int val;cin>>val;
			nums[pos]=val;
		}else{
			int l,r;cin>>l>>r;
			l--;r--;
			int ans=0;
			
			for(int i = l;i<=r;i++){
				int left = abs(l-i);
				int right= abs(r-i);
				int tot = n*(n+1)/2;
				int nbLeft = (left)*(left+1)/2;
				int nbRight = (right)*(right+1)/2;
				int parity = (tot-nbLeft-nbRight)&1;
				if(parity){
					ans^=nums[i];
				}
			}
			cout<<ans<<endl;
		}
	}
	return 0;
}

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