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Submission #410464

# Submission time Handle Problem Language Result Execution time Memory
410464 2021-05-22T18:10:13 Z nichke XOR Sum (info1cup17_xorsum) C++14
45 / 100
 1600 ms 20444 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n'

int n, res;
int ar[1000006];
int tar[1000006];

signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> ar[i];
	}
	for (int j = 0; j < 31; j++) {
		for (int i = 0; i < n; i++) {
			tar[i] = ar[i] % (1 << (j + 1));
		}
		sort(tar, tar + n);
		int sum = 0;
		for (int i = 0; i < n; i++) {
			int p1, p2, p3;
			p1 = p2 = p3 = i - 1;
			int l = i, r = n - 1;
			while (l <= r) {
				int m = (l + r) / 2;
				if (tar[i] + tar[m] < (1 << j)) {
					p1 = m;
					l = m + 1;
				} else {
					r = m - 1;
				}
			}
			l = i, r = n - 1;
			while (l <= r) {
				int m = (l + r) / 2;
				if (tar[i] + tar[m] < (2 * (1 << j))) {
					p2 = m;
					l = m + 1;
				} else {
					r = m - 1;
				}
			}
			l = i, r = n - 1;
			while (l <= r) {
				int m = (l + r) / 2;
				if (tar[i] + tar[m] < (3 * (1 << j))) {
					p3 = m;
					l = m + 1;
				} else {
					r = m - 1;
				}
			}
			sum += p2 - p1 + n - p3;
		}
		if (sum & 1) res += (1 << j);
	}
	cout << res << '\n';
	return 0;
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 332 KB Output is correct
2 Correct 16 ms 440 KB Output is correct

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1643 ms 20444 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1643 ms 20444 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
38.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 332 KB Output is correct
2 Correct 16 ms 440 KB Output is correct
3 Correct 487 ms 2820 KB Output is correct
4 Correct 481 ms 2816 KB Output is correct

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 332 KB Output is correct
2 Correct 16 ms 440 KB Output is correct
3 Execution timed out 1643 ms 20444 KB Time limit exceeded
4 Halted 0 ms 0 KB -