Submission #929239

#	Time	Username	Problem	Language	Result	Execution time	Memory
929239		bambaa	XORanges (eJOI19_xoranges)	C++14	75 / 100	441 ms	7576 KiB

xoranges

//#include <bits/stdc++.h>
#include <iostream>
#include <set>
#include <cmath>
#include <iterator>
#include <vector>
 
#define ff first
#define ss second
#define mp make_pair 
#define ll long long
 
using namespace std;
int main() {

	int n, q;
	cin >> n >> q;
	int a[n];
	for (int i = 0; i < n; i++){
	 	cin >> a[i];
	}
	if (n <= 5000 && q <= 5000){
		for (int lol = 0; lol < q; lol++){
			int x, y, z;
		 	cin >> x >> y >> z;
		 	if (x == 1) {a[y - 1] = z;}
		 	else {
		 		if ((z - y) % 2 == 1) {cout << "0" << endl; continue;}
		 		int p = a[y - 1];
		 		for (int i = y + 1; i < z; i = i + 2){
		 			p = (p ^ a[i]);
		 		}
		 		cout << p << endl;
		 	}
		}
	} else {
		int b[n];
		b[0] = a[0];   b[1] = b[1];
		for (int i = 2; i < n; i++){
			b[i] = (b[i - 2] ^ a[i]);
		}
		for (int lol = 0; lol < q; lol++){
			int x, y, z;
		 	cin >> x >> y >> z;
		 	if (x == 1) {a[y - 1] = z;}
		 	else {
		 		if ((z - y) % 2 == 1) {cout << "0" << endl;} else {
		 			int p = ((b[z - 1] ^ b[y - 1]) ^ a[y - 1]);
		 			cout << p << endl;
		 		}
		 	}
		}
	}
	return 0;
}

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