Submission #981718

#	Time	Username	Problem	Language	Result	Execution time	Memory
981718		Nomio	XORanges (eJOI19_xoranges)	C++17	30 / 100	145 ms	53416 KiB

xoranges

#include<bits/stdc++.h>
using namespace std;
int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n, q;
	cin >> n >> q;
	int a[n + 1], b[501][501] {}, c[n + 1][32] {}, d[n + 1][32] {};
	for(int i = 1; i <= n; i++) {
		cin >> a[i];
		int x = a[i], y = 31;
		while(x > 0) {
			c[i][y] = x % 2;
			x /= 2;
			y--;
		}
	}
	for(int i = 1; i <= n; i++) {
		for(int j = 0; j < 32; j++) {
			d[i][j] = d[i - 1][j] + c[i][j];
		}
	}
	if(n <= 500) {	
		for(int i = 1; i <= n; i++) {
			for(int j = 1; j <= n; j++) {
				for(int k = i; k <= min(i + j - 1, n); k++) {
					b[i][j] = (b[i][j] ^ a[k]);
				}
			}
		}
	}
	if(n <= 100) {
		while(q--) {
			int t, l, r;
			cin >> t >> l >> r;
			if(t == 1) {
				a[l] = r; 
			} else {
				int S = a[l];
				for(int i = l + 1; i <= r; i++) {
					S = (S ^ a[i]);
				}
				for(int i = 2; i <= r - l + 1; i++) {
					for(int j = l; j <= r - i + 1; j++) {
						int A = 0;
						for(int k = j; k <= j + i - 1; k++) {
							A = (A ^ a[k]);
						}
						S = (S ^ A);
					}
				}
				cout << S << '\n';
			}
		}
	} else if(n <= 500) {
		while(q--) {
			int t, l, r;
			cin >> t >> l >> r;
			int S = 0;
			for(int i = 1; i <= r - l + 1; i++) {
				for(int j = l; j <= r - i + 1; j++) {
					S = (S ^ b[j][i]);
				}
			}
			cout << S << '\n';
		}
	} else {
		while(q--) {
			int t, l, r;
			cin >> t >> l >> r;
			int A[32] {};
			int x = r - l + 1;
			for(int i = 0; i < 32; i++) {
				A[i] = (x * (d[r][i] - d[l - 1][i])) % 2;
			}
			for(int i = 0; i < 32; i++) {
				A[i] += (((r - l) * 2 - x) * (d[r - 1][i] - d[l][i]));
				A[i] %= 2;
			}
			int S = 0;
			for(int i = 0; i < 32; i++) {
				S += A[i] * (1 << (31 - i));
			}
			cout << S << '\n';
		}
	}
	return 0;
}

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