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Submission #1092510

# Submission time Handle Problem Language Result Execution time Memory
1092510 2024-09-24T09:01:42 Z pubin06 XOR Sum (info1cup17_xorsum) C++14
100 / 100
 540 ms 24172 KB 
#include <bits/stdc++.h>
#define fi first
#define se second
#define sz(v) (int)(v).size()
using namespace std;
 
const int MXn = 1000005;
const long long oo = 1e18;
const int MOD = 1e9 + 7;
 
int N;
int a[MXn];
int t[MXn];
 
signed main(void) {
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    
    cin >> N;
    for (int i = 1; i <= N; i++) cin >> a[i];
    int mask = 0;
    int ans = 0;
    vector<int> v[2];
    v[0].resize(N);
    iota(begin(v[0]), end(v[0]), 1);
    for (int k = 0; k < 30; k++) {
    	mask |= (1 << k);
    	int num = 0;
    	vector<int> tmp[2];
    	for (int id: v[0]) tmp[(a[id] >> k) & 1].emplace_back(id);
    	for (int id: v[1]) tmp[(a[id] >> k) & 1].emplace_back(id);
    	v[0] = tmp[0];
    	v[1] = tmp[1];
    	for (int id: v[0]) t[++num] = (a[id] & mask);
    	for (int id: v[1]) t[++num] = (a[id] & mask);
    	int p1 = N, p2 = N, p3 = N;
    	int cnt = 0;
    	for (int i = 1; i <= N; i++) {
    		while (t[i] + t[p1] >= (1 << k) && p1 >= i) p1--;
    		while (t[i] + t[p2] >= (1 << (k + 1)) && p2 >= i) p2--;
    		while (t[i] + t[p3] >= ((1 << (k + 1)) + (1 << k)) && p3 >= i) p3--;
    		cnt += (max(p2, i - 1) - max(p1, i - 1)) + (N - max(i, p3 + 1) + 1);
    		cnt &= 1;
    	}
    	ans += (cnt << k);
    }
    cout << ans;
    
    return 0;
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 348 KB Output is correct
2 Correct 2 ms 348 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 395 ms 24096 KB Output is correct
2 Correct 356 ms 21912 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 395 ms 24096 KB Output is correct
2 Correct 356 ms 21912 KB Output is correct
3 Correct 433 ms 23736 KB Output is correct
4 Correct 403 ms 23316 KB Output is correct

Subtask #4
38.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 348 KB Output is correct
2 Correct 2 ms 348 KB Output is correct
3 Correct 46 ms 2864 KB Output is correct
4 Correct 47 ms 2864 KB Output is correct

Subtask #5
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 348 KB Output is correct
2 Correct 2 ms 348 KB Output is correct
3 Correct 395 ms 24096 KB Output is correct
4 Correct 356 ms 21912 KB Output is correct
5 Correct 433 ms 23736 KB Output is correct
6 Correct 403 ms 23316 KB Output is correct
7 Correct 46 ms 2864 KB Output is correct
8 Correct 47 ms 2864 KB Output is correct
9 Correct 526 ms 24172 KB Output is correct
10 Correct 498 ms 24148 KB Output is correct
11 Correct 540 ms 24116 KB Output is correct