oj.uz

Submission #413465

# Submission time Handle Problem Language Result Execution time Memory
413465 2021-05-28T18:39:23 Z KKT89 XOR Sum (info1cup17_xorsum) C++17
0 / 100
 745 ms 8848 KB 
#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}

int main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	int n; cin >> n;
	vector<int> a(n);
	for(int i=0;i<n;i++){
		cin >> a[i];
	}
	int res=0;
	for(int v=(1<<28);v;v>>=1){
		for(int i=0;i<n;i++){
			a[i]&=(v*2-1);
		}
		sort(a.begin(), a.end());
		int t=0;
		for(int i=n-1,j=0,k=0,l=0;i>=0;i--){
			while(j<n and a[i]+a[j]<v)j++;
			while(k<n and a[i]+a[k]<2*v)k++;
			while(l<n and a[i]+a[l]<3*v)l++;
			t+=(k-j)+(n-l);
			t&=1;
		}
		if(t)res^=v;
	}
	cout << res << endl;
}

Subtask #1
0 / 7.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 745 ms 8848 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 745 ms 8848 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 38.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -